* 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.
* arm/crt0.S: Copied from newlib and it now also sets up stacks for
FIQ and IRQ mode, plus calls hardware_init_hook() and
software_init_hook() if present.
* arm/libcfunc.c, arm/swi.h, arm/syscalls.c: Copied
from newlib.
* arm/Makefile.in: Build crt0.o, rdpmon-crt0.o, rdimon-crt0.o,
librdpmon.a, librdimon.a - support file for "bare" setup, as well
as "RDP" and "RDI" monitors.
* arm/coff-rdpmon.specs, arm/elf-rdpmon.specs,
arm/coff-rdimon.specs, arm/elf-rdimon.specs: gcc specs files to go
with above mentioned support libs and startfiles.
