build system: Test gccs that are actually used

Test that the compilers used for the target are
built by our buildgcc utility. Users can override
this test with the ANY_TOOLCHAIN Kconfig variable.

Change-Id: I24adf2c9b83667fd34ce8eb103327c9376765f6d
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: http://review.coreboot.org/9055
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2 files changed