cc/gcc: no need to build a static core pass-1 gcc for baremetal

The only user of the static core compiler in pass-1 was the newlib
C library. Now that it is build in a later step, we do no longer
need to build a static core compiler in pass-1.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 # Default test suite configuration

 # Default DejaGnu configuration

 DG_TOOLNAME = gcc

 DG_TARGET_HOSTNAME = 127.0.0.1

 DG_TARGET_USERNAME = root

 # Default tests

 DG_C_TESTS = 

 DG_CPP_TESTS =