whisper : deprecate WHISPER_CCACHE CMake option (#3131)

* whisper : deprecate WHISPER_CCACHE CMake option

This commit deprecates the WHISPER_CCACHE CMake option in favor of
the GGML_CCACHE option.

The motivation for this change is that currently when setting, or not
setting WHISPER_CCACHE, the outut message from ggml will be that to
enable ccache you need to set GGML_CCACHE which can be confusing.
This also seems to be inline with what llama.cpp does which does not
have a LLAMA_CCACHE option as far as I know.

Resolves: https://github.com/ggml-org/whisper.cpp/issues/3063

* ruby : change "WHISPER_CCACHE" to "GGML_CCACHE"

* ruby : move GGML_CCACHE to sorted position

CMakeLists.txt

@@ -59,9 +59,6 @@ option(BUILD_SHARED_LIBS "build shared libraries" ${BUILD_SHARED_LIBS_DEFAULT})
 # option list
 #
 
-# general
-option(WHISPER_CCACHE "whisper: use ccache if available" ON)
-
 # debug
 option(WHISPER_ALL_WARNINGS           "whisper: enable all compiler warnings"                   ON)
 option(WHISPER_ALL_WARNINGS_3RD_PARTY "whisper: enable all compiler warnings in 3rd party libs" OFF)
@@ -96,7 +93,6 @@ option(WHISPER_OPENVINO              "whisper: support for OpenVINO"      OFF)
 include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/build-info.cmake)
 
 # override ggml options
-set(GGML_CCACHE             ${WHISPER_CCACHE})
 set(GGML_SANITIZE_THREAD    ${WHISPER_SANITIZE_THREAD})
 set(GGML_SANITIZE_ADDRESS   ${WHISPER_SANITIZE_ADDRESS})
 set(GGML_SANITIZE_UNDEFINED ${WHISPER_SANITIZE_UNDEFINED})
@@ -121,6 +117,7 @@ whisper_option_depr(WARNING     WHISPER_OPENMP              GGML_OPENMP)
 whisper_option_depr(WARNING     WHISPER_RPC                 GGML_RPC)
 whisper_option_depr(WARNING     WHISPER_SYCL                GGML_SYCL)
 whisper_option_depr(WARNING     WHISPER_SYCL_F16            GGML_SYCL_F16)
+whisper_option_depr(WARNING     WHISPER_CCACHE              GGML_CCACHE)
 
 #
 # build the library