toolchain-shar-extract: compare SDK and host gcc versions
If ext sdk is built by gcc version higher than host gcc version
and host gcc version is 4.8 or 4.9 the installation is known to
fail due to the way uninative sstate package is built.
It's a known issue and we don't have a way to fix it for above
mentioned combinations of build and host gcc versions.
Detected non-installable combinations of gcc versions and
print an installation error.
[YOCTO #10881]
Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
