Externals: Add glslang from Vulkan SDK v1.0.21.1

Externals/glslang/hlsl/CMakeLists.txt

@@ -0,0 +1,26 @@
+set(SOURCES
+    hlslParseHelper.cpp
+    hlslScanContext.cpp
+    hlslOpMap.cpp
+    hlslTokenStream.cpp
+    hlslGrammar.cpp
+    hlslParseables.cpp)
+
+set(HEADERS
+    hlslParseHelper.h
+    hlslTokens.h
+    hlslScanContext.h
+    hlslOpMap.h
+    hlslTokenStream.h
+    hlslGrammar.h
+    hlslParseables.h)
+
+add_library(HLSL STATIC ${SOURCES} ${HEADERS})
+set_property(TARGET HLSL PROPERTY FOLDER hlsl)
+
+if(WIN32)
+    source_group("Source" FILES ${SOURCES} ${HEADERS})
+endif(WIN32)
+
+install(TARGETS HLSL
+        ARCHIVE DESTINATION lib)