Android toolchain: fixed ccache search

android/android.toolchain.cmake

@@ -692,8 +692,7 @@ endif()
 # ccache support
 __INIT_VARIABLE( NDK_CCACHE ENV_NDK_CCACHE )
 if( NDK_CCACHE )
- get_filename_component(NDK_CCACHE "${NDK_CCACHE}" ABSOLUTE)
- set( NDK_CCACHE "${NDK_CCACHE}" CACHE PATH "The path to ccache binary" FORCE )
+ find_program(NDK_CCACHE "${NDK_CCACHE}" DOC "The path to ccache binary")
 else()
  unset( NDK_CCACHE )
 endif()