Added support ccache for speedup compilation on Linux

Author: GermanAizek

CMakeLists.txt

@@ -69,6 +69,13 @@ endif()
 set(ENABLE_UPDATE_CHECKER (NOT ${DEVELOPMENT_BUILD}) CACHE BOOL
 	"Whether to enable update checks by default")
 
+find_program(CCACHE_FOUND ccache)
+if (CCACHE_FOUND)
+    set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
+    set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
+    set(ENV{CCACHE_SLOPPINESS} pch_defines,time_macros)
+endif ()
+
 # Included stuff
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")