icecc: Export ICECC_CC and friends via wrapper-script
By exporting ICECC_CC, ICECC_CXX, and ICECC_VERSION in a wrapper-script,
and putting this wrapper-script in the PATH, the Makefiles generated by CMake or
the autotools are able to function correctly outside of bitbake.
This provides a convenient developer workflow in which the
modify-compile-unittest cycle can happen directly in the ${B} directory.
The `rm -f $ICE_PATH/$compiler` line is transitional,
and can go at some later date (October 2020 or later, perhaps).
Signed-off-by: Douglas Royds <douglas.royds@taitradio.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
