ceph: disable ccache
ceph: disable ccache

When enable ccache for ceph, error occurs:
-----------------------------------------------------
    ccache: invalid option -- 'E'
    ...
    Unable to determine C++ standard library, got .
-----------------------------------------------------
This is because variable "CXX_STDLIB" was null in CMakeLists.txt line: 637,
The "CXX_STDLIB" come from:
-----------------------------------------------------
    execute_process(
      COMMAND ./librarytest.sh ${CMAKE_CXX_COMPILER} ${CMAKE_CXX_FLAGS}
      WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
      OUTPUT_VARIABLE CXX_STDLIB
      )
-----------------------------------------------------
The script librarytest.sh in ceph accept argument: compile and flags, but when
enable ccache, the compile replace by ccache, so that script failed.

So we disable ccache for ceph now.

Signed-off-by: Dengke Du <dengke.du@windriver.com>

Signed-off-by: Bruce Ashfield <284cc737d174a260eec2a2a6324a304f84b1ae0f@gmail.com>

lgirdk/meta-virtualization,lgirdk/meta-virtualization,lgirdk/meta-virtualization,lgirdk/meta-virtualization,lgirdk/meta-virtualization