[godot] Fix iOS build error with Vulkan headers and C++ modules

Adds compiler flag -Wno-error=module-import-in-extern-c to suppress compilation errors when building for iOS with newer Xcode versions. The Vulkan headers include stdint.h inside extern "C" blocks, which conflicts with C++ modules.

The fix is applied via a patch file during setup.sh execution.

spine-godot/build/ios-vulkan-fix.patch

@@ -0,0 +1,14 @@
+diff --git a/platform/ios/detect.py b/platform/ios/detect.py
+index 53b367a0a7..aea9424abe 100644
+--- a/platform/ios/detect.py
++++ b/platform/ios/detect.py
+@@ -144,6 +144,9 @@ def configure(env: "SConsEnvironment"):
+     # Temp fix for ABS/MAX/MIN macros in iOS SDK blocking compilation
+     env.Append(CCFLAGS=["-Wno-ambiguous-macro"])
+ 
++    # Fix for C++ module imports in extern "C" blocks in Vulkan headers
++    env.Append(CCFLAGS=["-Wno-error=module-import-in-extern-c"])
++
+     env.Prepend(
+         CPPPATH=[
+             "$IOS_SDK_PATH/usr/include",

spine-godot/build/setup.sh

@@ -70,6 +70,14 @@ if [ "$branch" = "4.3-stable" ]; then
     popd
 fi
 
+# Apply iOS Vulkan fix for C++ module imports in extern "C" blocks
+# This fixes compilation errors with newer Xcode versions
+pushd godot
+if [ -f ../build/ios-vulkan-fix.patch ]; then
+    git apply ../build/ios-vulkan-fix.patch
+fi
+popd
+
 popd
 
 # Generate compile_commands.json for IDE integration (only in dev mode)