* arm/configure.in: Check the value of newlib-may-supply-syscalls
enablement variable to determine if crt0 should or should not be
built.
* arm/configure: Regenerated.
* arm/Makefile.in: Changed to look at @BUILD_CRT0_TRUE@ and
@BUILD_CRT0_FALSE@ variables set in configure to determine
if crt0.o should be built and installed.