* libc/sys/arc/dummy.S: Dummy file to force .S.o suffix rule.
* libc/sys/arc/Makefile.am: Add dummy.S to EXTRA_lib_a_SOURCES
and set lib_a_CCASFLAGS so crto.o will use .S.o default suffix rule.
* libc/sys/arc/Makefile.in: Regenerated.
* acinclude.m4: Check for readelf tool.
* configure.in: Use ${READELF} instead of hard-coding.
* Regenerate all aclocal.m4, Makefile.in, and configure files.
* 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.