Modernise CMake

* Use `GNUInstallDirs` in order to respect GNU conventions.
  This is especially important for multi-arch/multi-lib setups.
* Specify position independent mode building properly, without
  using the historic hack of adding `-fPIC` as a definition.
  This makes the build system more portable.
* Only detect C++ (and not C) to slightly speed up configuring.
* Specify C++11 mode using modern CMake idioms.
* Fix some whitespace issues.

hlsl/CMakeLists.txt

@@ -7,7 +7,7 @@ set(SOURCES
     hlslGrammar.cpp
     hlslParseables.cpp)
 
-  set(HEADERS
+set(HEADERS
     hlslAttributes.h
     hlslParseHelper.h
     hlslTokens.h
@@ -18,11 +18,11 @@ set(SOURCES
     hlslParseables.h)
 
 add_library(HLSL STATIC ${SOURCES} ${HEADERS})
-set_property(TARGET HLSL PROPERTY FOLDER hlsl)
+set_property(TARGET HLSL PROPERTY FOLDER hlsl POSITION_INDEPENDENT_CODE ON)
 
 if(WIN32)
     source_group("Source" FILES ${SOURCES} ${HEADERS})
 endif(WIN32)
 
 install(TARGETS HLSL
-        ARCHIVE DESTINATION lib)
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})