* configure.host: Set have_crt0 to no for Arm targts when not
providing syscalls. Set sys_dir=arm unconditionally.
Default have_crt0 based on sys_dir.
* configure.in: Use have_crt0.
* libc/configure.in: Ditto.
* libc/sys/configure.in: Ditto.
* configure: Regenerate.
* libc/configure: Regenerate.
* libc/sys/configure: Regenerate.
* libc/sys/arm/Makefile.am (lib_a_SOURCES): Add aeabi_atexit.c.
Only build other files when providing syscalls.
* libc/sys/arm/Makefile.in: Regenerate.
* libc/sys/arm/aeabi_atexit.c: New file.
* libc/sys/arm/setjmp.S, libc/sys/arm/access.c: Move
files from libc/sys/arm to libc/machine/arm.
* libc/machine/arm/Makefile.am, libc/machine/arm/Makefile.in: Add
library build support for files moved from libc/sys/arm.
* libc/sys/arm/Makefile.am, libc/sys/arm/Makefile.in: Remove
references to access and setjmp.
* configure.host: Add checks for newlib_may_supply_syscalls to
determine whether or not to use sys/arm directory and use
special compiler flags: ARM_RDI_MONITOR and ARM_RDP_MONITOR.
* acinclude.m4 (--disable-newlib-supplied-syscalls): New configuration
option to allow disabling of syscalls being supplied in newlib.
* aclocal.m4: Regenerated.
* configure: Ditto.
* configure.host: Add support of new configuration option and add
-D__NO_SYSCALLS__ if newlib supplied syscalls are disabled.
* doc/aclocal.m4: Regenerated.
* doc/configure: Ditto.
* libc/*aclocal.m4: Ditto.
* libc/*configure: Ditto.
* libm/*aclocal.m4: Ditto.
* libm/*configure: Ditto.
* libc/sys/arm/Makefile.am: Don't build syscalls.o if new option
is disabled.
* libc/sys/arm/Makefile.in: Regenerated.
