gcc-crosssdk: keep the same provider for all gcc packages

addresses nativesdk-gcc-runtime failing in do_configure
checking dynamic linker characteristics... configure: error: Link tests are not allowed after GCC_NO_EXECUTABLES.
caused by a mismatch between gcc providers.

Signed-off-by: Max Krummenacher <max.oss.09@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>