* 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.
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