Revert "CI: macOS compilation fix (Vulkan missing hdr)"

No longer needed - GH macos-12 runner has VK v1.3.268, which doesn't
miss the needed header.

This reverts commit 70d1c51.

.github/scripts/macOS/prepare.sh

@@ -31,12 +31,6 @@ brew install imagemagick libcaca libnatpmp jack opencv wolfssl
 brew install ossp-uuid # for cineform
 brew install qt
 brew install glm
-# TOREMOVE - missing header in Vulkan v1.3.264
-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