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.