Remove WebM support (and deps libvpx and opus)

We've had many issues with WebM support and specifically the libvpx library
over the years, mostly due to its poor integration in Godot's buildsystem,
but without anyone really interested in improving this state.

With the new GDExtensions in Godot 4.0, we intend to move video decoding to
first-party extensions, and this would likely be done using something like
libvlc to expose more codecs.

Removing the `webm` module means we can remove libsimplewebm, libvpx and
opus, which we were only used for that purpose. Both libvpx and opus were
fairly complex pieces of the buildsystem, so this is a nice cleanup.

This also removes the compile-time dependency on `yasm`.

Fixes lots of compilation or non-working WebM issues which will be linked
in the PR.

1 files changed, 0 insertions, 135 deletions

diff --git a/thirdparty/libvpx/vp8/common/quant_common.c b/thirdparty/libvpx/vp8/common/quant_common.c
deleted file mode 100644
index 05f9210702..0000000000
--- a/thirdparty/libvpx/vp8/common/quant_common.c
+++ /dev/null
@@ -1,135 +0,0 @@
-/*
- *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-
-#include "quant_common.h"
-
-static const int dc_qlookup[QINDEX_RANGE] =
-{
-    4,    5,    6,    7,    8,    9,   10,   10,   11,   12,   13,   14,   15,   16,   17,   17,
-    18,   19,   20,   20,   21,   21,   22,   22,   23,   23,   24,   25,   25,   26,   27,   28,
-    29,   30,   31,   32,   33,   34,   35,   36,   37,   37,   38,   39,   40,   41,   42,   43,
-    44,   45,   46,   46,   47,   48,   49,   50,   51,   52,   53,   54,   55,   56,   57,   58,
-    59,   60,   61,   62,   63,   64,   65,   66,   67,   68,   69,   70,   71,   72,   73,   74,
-    75,   76,   76,   77,   78,   79,   80,   81,   82,   83,   84,   85,   86,   87,   88,   89,
-    91,   93,   95,   96,   98,  100,  101,  102,  104,  106,  108,  110,  112,  114,  116,  118,
-    122,  124,  126,  128,  130,  132,  134,  136,  138,  140,  143,  145,  148,  151,  154,  157,
-};
-
-static const int ac_qlookup[QINDEX_RANGE] =
-{
-    4,    5,    6,    7,    8,    9,   10,   11,   12,   13,   14,   15,   16,   17,   18,   19,
-    20,   21,   22,   23,   24,   25,   26,   27,   28,   29,   30,   31,   32,   33,   34,   35,
-    36,   37,   38,   39,   40,   41,   42,   43,   44,   45,   46,   47,   48,   49,   50,   51,
-    52,   53,   54,   55,   56,   57,   58,   60,   62,   64,   66,   68,   70,   72,   74,   76,
-    78,   80,   82,   84,   86,   88,   90,   92,   94,   96,   98,  100,  102,  104,  106,  108,
-    110,  112,  114,  116,  119,  122,  125,  128,  131,  134,  137,  140,  143,  146,  149,  152,
-    155,  158,  161,  164,  167,  170,  173,  177,  181,  185,  189,  193,  197,  201,  205,  209,
-    213,  217,  221,  225,  229,  234,  239,  245,  249,  254,  259,  264,  269,  274,  279,  284,
-};
-
-
-int vp8_dc_quant(int QIndex, int Delta)
-{
-    int retval;
-
-    QIndex = QIndex + Delta;
-
-    if (QIndex > 127)
-        QIndex = 127;
-    else if (QIndex < 0)
-        QIndex = 0;
-
-    retval = dc_qlookup[ QIndex ];
-    return retval;
-}
-
-int vp8_dc2quant(int QIndex, int Delta)
-{
-    int retval;
-
-    QIndex = QIndex + Delta;
-
-    if (QIndex > 127)
-        QIndex = 127;
-    else if (QIndex < 0)
-        QIndex = 0;
-
-    retval = dc_qlookup[ QIndex ] * 2;
-    return retval;
-
-}
-int vp8_dc_uv_quant(int QIndex, int Delta)
-{
-    int retval;
-
-    QIndex = QIndex + Delta;
-
-    if (QIndex > 127)
-        QIndex = 127;
-    else if (QIndex < 0)
-        QIndex = 0;
-
-    retval = dc_qlookup[ QIndex ];
-
-    if (retval > 132)
-        retval = 132;
-
-    return retval;
-}
-
-int vp8_ac_yquant(int QIndex)
-{
-    int retval;
-
-    if (QIndex > 127)
-        QIndex = 127;
-    else if (QIndex < 0)
-        QIndex = 0;
-
-    retval = ac_qlookup[ QIndex ];
-    return retval;
-}
-
-int vp8_ac2quant(int QIndex, int Delta)
-{
-    int retval;
-
-    QIndex = QIndex + Delta;
-
-    if (QIndex > 127)
-        QIndex = 127;
-    else if (QIndex < 0)
-        QIndex = 0;
-
-    /* For all x in [0..284], x*155/100 is bitwise equal to (x*101581) >> 16.
-     * The smallest precision for that is '(x*6349) >> 12' but 16 is a good
-     * word size. */
-    retval = (ac_qlookup[ QIndex ] * 101581) >> 16;
-
-    if (retval < 8)
-        retval = 8;
-
-    return retval;
-}
-int vp8_ac_uv_quant(int QIndex, int Delta)
-{
-    int retval;
-
-    QIndex = QIndex + Delta;
-
-    if (QIndex > 127)
-        QIndex = 127;
-    else if (QIndex < 0)
-        QIndex = 0;
-
-    retval = ac_qlookup[ QIndex ];
-    return retval;
-}