gcc424: fix libgcc visibility issue for stage0 builds on ARM

UNTESTED - should work, but was not tested.

since arm needs to use a different stage0 compiler than all other
archs, the issue described in 96a61e33 was encountered on ARM as
well (it was only fixed for gcc3).

openssl: hidden symbol `__aeabi_uidiv' in /opt/gcc473/bin/../
lib/gcc/armv7l-unknown-linux-gnueabi/4.7.3/libgcc.a(_udivsi3.o)
is referenced by DSO