Dynamically load libudev.so.1 on Linux if `udev=yes`

This makes it possibly to run Linux binaries compiled with udev support on
Linux systems which do not provide udev (typically systemd-less distros).

If udev is missing, we fall back to parsing `/dev/input` like when compiled
without udev support (`udev=no`).

Also adding some verbose debug statements to know which method we're using
when debugging Linux joypad issues.

The libudev so wrappers were generated on Mageia 8 with libudev 246.9 using
https://github.com/hpvb/dynload-wrapper:
```
./generate-wrapper.py --include /usr/include/libudev.h --sys-include '<libudev.h>' \
  --soname libudev.so.1 --init-name libudev --omit-prefix gnu_ \
  --output-header libudev-so_wrap.h --output-implementation libudev-so_wrap.c
```

2 files changed, 5 insertions, 0 deletions

diff --git a/misc/hooks/pre-commit-clang-format b/misc/hooks/pre-commit-clang-format
index 6467efe22e..1cbc576565 100755
--- a/misc/hooks/pre-commit-clang-format
+++ b/misc/hooks/pre-commit-clang-format
@@ -125,6 +125,9 @@ do
     if grep -q "platform/android/java/lib/src/com" <<< $file; then
         continue;
     fi
+    if grep -q "\-so_wrap." <<< $file; then
+        continue;
+    fi
 
     # ignore file if we do check for file extensions and the file
     # does not match any of the extensions specified in $FILE_EXTS
diff --git a/misc/scripts/file_format.sh b/misc/scripts/file_format.sh
index 0e9db68a90..d84f693066 100755
--- a/misc/scripts/file_format.sh
+++ b/misc/scripts/file_format.sh
@@ -30,6 +30,8 @@ while IFS= read -rd '' f; do
         continue
     elif [[ "$f" == "platform/android/java/lib/src/com/google"* ]]; then
         continue
+    elif [[ "$f" == *"-so_wrap."* ]]; then
+        continue
     fi
     # Ensure that files are UTF-8 formatted.
     recode UTF-8 "$f" 2> /dev/null