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

 CT_LOCAL_TARBALLS_DIR="${HOME}/src"

 CT_SAVE_TARBALLS=y

 CT_CONFIG_SHELL_SH=y

 CT_LOG_EXTRA=y

 CT_ARCH_avr32=y

 CT_BINUTILS_V_2_18a=y

 CT_CC_V_4_2_2=y

 CT_LIBC_NEWLIB_V_1_17_0=y

 CT_LIBC_NEWLIB_IO_LL=y

 CT_LIBC_NEWLIB_IO_FLOAT=y

 CT_LIBC_NEWLIB_DISABLE_SUPPLIED_SYSCALLS=y