Skip irrelevant submodules when building on Arch (#817)

Co-authored-by: ReenigneArcher <42013603+ReenigneArcher@users.noreply.github.com>

packaging/linux/aur/PKGBUILD

@@ -22,7 +22,28 @@ sha256sums=('SKIP')
 
 prepare() {
     cd "$pkgname"
-    git submodule update --recursive --init
+    # Skip submodules that we don't want
+    if [[ $CARCH == "x86_64" ]]; then
+        git -c submodule."ffmpeg-macos-x86_64".update=none \
+            -c submodule."ffmpeg-windows-x86_64".update=none \
+            -c submodule."ffmpeg-linux-aarch64".update=none \
+            -c submodule."ffmpeg-macos-aarch64".update=none \
+            submodule update --recursive --init
+    elif [[ $CARCH == "aarch64" ]]; then
+        git -c submodule."ffmpeg-macos-x86_64".update=none \
+            -c submodule."ffmpeg-windows-x86_64".update=none \
+            -c submodule."ffmpeg-linux-x86_64".update=none \
+            -c submodule."ffmpeg-macos-aarch64".update=none \
+            submodule update --recursive --init
+
+    # It's unlikely that someone could get this far on a system with an incorrect arch, but we should handle it anyway
+    # Pull linux ffmpeg submodules
+    else
+        git -c submodule."ffmpeg-macos-x86_64".update=none \
+            -c submodule."ffmpeg-windows-x86_64".update=none \
+            -c submodule."ffmpeg-macos-aarch64".update=none \
+            submodule update --recursive --init
+    fi
 }
 
 build() {