cmake: Remove unnecessary ccache logic

Rely on CMAKE_C_COMPILER_LAUNCHER instead of homegrown logic

See CMake's documentation for more information
https://cmake.org/cmake/help/latest/variable/CMAKE_LANG_COMPILER_LAUNCHER.html

Author: diizzyy

CMakeLists.txt

@@ -33,20 +33,6 @@ include(sources.cmake)
 #-----------------------------------------------------------------------------
 option(BUILD_SHARED_LIBS "Build shared library and only the shared library if \"ON\", default is static" OFF)
 
-#-----------------------------------------------------------------------------
-# Add support for ccache if desired
-#-----------------------------------------------------------------------------
-find_program(CCACHE ccache)
-
-if(CCACHE)
-    option(ENABLE_CCACHE "Enable ccache." ON)
-endif()
-
-# use ccache if installed
-if(CCACHE AND ENABLE_CCACHE)
-    set(CMAKE_C_COMPILER_LAUNCHER ${CCACHE})
-endif()
-
 #-----------------------------------------------------------------------------
 # Compose CFLAGS
 #-----------------------------------------------------------------------------