MCOL-4117: Clean away unnecessary USE_CCACHE build flag #1314
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Systems with ccache will have gcc/g++ automatically wrapped by ccache
and there is no need inject 'ccache' into the build command like this.
No other part of the MariaDB Server nor in general other software have
any USE_CCACHE practice. To all of them ccache works transparently, and
extra code like this is unnecessay and just plain confusing.
This commit does not yet close MCOL-4117, but is a step forward in making
the code base compatible with using ccache in build systems in general.