cc/gcc: fix parallel build with gcc 4.8.0, 4.8.1 and 4.8.2

Fix the problem with parallel build on gcc 4.8.0, 4.8.1 and 4.8.2
See: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57683

and

http://gcc.gnu.org/viewcvs?rev=205189&root=gcc&view=rev
Log:
2013-11-21 Zhenqiang Chen <zhenqiang.chen@linaro.org>

PR bootstrap/57683
Backport from mainline: r197467 and r198999.
2013-04-03 Jeff Law <law@redhat.com>

* Makefile.in (lra-constraints.o): Depend on $(OPTABS_H).
(lra-eliminations.o): Likewise.

2013-05-16 Jeff Law <law@redhat.com>

* Makefile.in (tree-switch-conversion.o): Depend on $(OPTABS_H).

Signed-off-by: "Daniel Zimmermann" <netzimme@gmail.com>
Message-Id: <66398633eea949023e0d.1385290839@haus-VirtualBox>
Patchwork-Id: 293742

# s390 specific config options

## select ARCH_SUPPORTS_32

## select ARCH_SUPPORTS_64

## select ARCH_DEFAULT_32

## select ARCH_USE_MMU

## select ARCH_SUPPORTS_WITH_FPU

##

## help Defined by IBM in:

## help     32-bit ESA/390       : http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/dz9ar008/CCONTENTS

## help     64-bit z/Architecure : http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/dz9zr002/CCONTENTS