Modernise CMake #2

This reverts commit cfc69d95afed34e1ba1371df0ddb56f2f491a5cb.
* Change CMAKE_INSTALL_PREFIX default on Windows in order
  to prevent permission denied errors when trying to install
  to "Program Files".
diff --git a/hlsl/CMakeLists.txt b/hlsl/CMakeLists.txt
index ec5f1a5..24f5c9a 100755
--- a/hlsl/CMakeLists.txt
+++ b/hlsl/CMakeLists.txt
@@ -7,7 +7,7 @@
     hlslGrammar.cpp
     hlslParseables.cpp)
 
-  set(HEADERS
+set(HEADERS
     hlslAttributes.h
     hlslParseHelper.h
     hlslTokens.h
@@ -18,11 +18,11 @@
     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})