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

# MicroBlaze specific config options

## depends on EXPERIMENTAL

##

## select ARCH_SUPPORT_ARCH

## select ARCH_FLOAT_SW

## select ARCH_SUPPORTS_BOTH_ENDIAN

## select ARCH_DEFAULT_BE

## select ARCH_SUPPORTS_BOTH_MMU

## select ARCH_DEFAULT_HAS_MMU

##

## help The MicroBlaze architecture, as defined by:

## help 	http://www.xilinx.com/

## help 

## help Upstream projects do not currently provide

## help full support for the microblaze architecture

## help and as such, this is marked as EXPERIMENTAL

## help for CT-NG.

## help 

## help Support is being added for a modern gcc,

## help binutils and gdb along with nptl threading

## help in eglibc for microblaze.