whisper : deprecate WHISPER_CCACHE CMake option (#3131)

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