CMake: Fix usage with ccache

Add missing -DCCACHE option to fix builds with ccache.

Signed-off-by: Avery King <[email protected]>

CMakeLists.txt

@@ -202,12 +202,14 @@ else()
    message( STATUS "Could NOT find ccache nor sccache, no compiler caching enabled" )
 endif()
 
-find_program( SCCACHE_PROGRAM sccache )
-mark_as_advanced( FORCE SCCACHE_PROGRAM )
 if(NOT "${SCCACHE_PROGRAM}" STREQUAL "SCCACHE_PROGRAM-NOTFOUND")
   option(SCCACHE "Use sccache for compiler caching to speed up rebuilds." ON)
 endif()
 
+if(NOT "${CCACHE_PROGRAM}" STREQUAL "CCACHE_PROGRAM-NOTFOUND")
+  option(CCACHE "Use ccache for compiler caching to speed up rebuilds." ON)
+endif()
+
 # Prefer sccache if both ccache and sccache are found because Windows users may have
 # ccache installed with MinGW which would not work with MSVC.
 if(SCCACHE)