Don't automagically use ccache https://bugs.gentoo.org/847439

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -160,7 +160,7 @@ IF(OPENGL_DEBUG_LOGGING)
 ENDIF()
 
 # Use ccache if possible
-IF(NOT WIN32)
+IF(FALSE)
      FIND_PROGRAM(CCACHE_PROGRAM ccache)
      IF(CCACHE_PROGRAM)
           MESSAGE(STATUS "Found ccache ${CCACHE_PROGRAM}")