CI macOS workaround: apply only if needed

ensure that if forgot to remove, there won't be issues in future

.github/scripts/macOS/prepare.sh

@@ -34,9 +34,11 @@ brew install glm
 sudo curl -L https://raw.githubusercontent.com/miniupnp/libnatpmp/master/\
 natpmp_declspec.h -o /usr/local/include/natpmp_declspec.h
 # TOREMOVE - missing header in Vulkan v1.3.264
-sudo curl -L https://raw.githubusercontent.com/KhronosGroup/Vulkan-Headers/main/\
+if [ "$(brew info vulkan-headers | awk 'NR==1{print $4}')" = 1.3.264 ]; then
+        sudo curl -L https://raw.githubusercontent.com/KhronosGroup/Vulkan-Headers/main/\
 include/vulkan/vulkan_hpp_macros.hpp -o /usr/local/include/vulkan/\
 vulkan_hpp_macros.hpp
+fi
 
 .github/scripts/macOS/install_dylibbundler_v2.sh