CMake: Keep glslang's HLSL frontend on Windows

MinGW/Cygwin CMake builds should match the MSVC and UWP glslang projects,
which build with ENABLE_HLSL.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ext/CMakeLists.txt

@@ -18,8 +18,10 @@ set(ENABLE_SPVREMAPPER OFF CACHE BOOL "we don't need spvremapper" FORCE)
 set(ZLIB_BUILD_EXAMPLES OFF CACHE BOOL "we don't need zlib examples" FORCE)
 
 # We only feed glslang GLSL, so its HLSL frontend is dead weight (and once hit an NDK 20 compiler
-# issue, PPSSPP issue #12105).
-set(ENABLE_HLSL OFF CACHE BOOL "let's not build HLSL support we don't need" FORCE)
+# issue, PPSSPP issue #12105). Windows keeps it, to match the MSVC and UWP projects.
+if(NOT WIN32)
+	set(ENABLE_HLSL OFF CACHE BOOL "let's not build HLSL support we don't need" FORCE)
+endif()
 
 # This works around a bug in cpu_features when ${CMAKE_BINARY_DIR} != ${CMAKE_CURRENT_BINRARY_DIR}.
 # We also disable the list_cpu_features binary.