tcmode-default: workaround for gcc 4.6.0 failure on beagleboard

tcmode-default: workaround for gcc 4.6.0 failure on beagleboard

mesa-xlib: workaround gcc 4.6.0 ICE

Fixes this bug [YOCTO #1105]

Working around this issue withg gcc 4.6.0 for beagleboard machine (armv7)

ccache arm-poky-linux-gnueabi-gcc -march=armv7-a -mtune=cortex-a8 -mfpu=neon
-mfloat-abi=softfp -fno-tree-vectorize
--sysroot=/build_disk/poky_build/build0/tmp/sysroots/beagleboard -c -I.
-I../../../../src/gallium/include -I../../../../src/gallium/auxiliary
-I../../../../src/gallium/drivers
-I../../../../src/gallium/drivers/svga/include -O2 -pipe -g
-feliminate-unused-debug-types -Wall -Wmissing-prototypes -std=c99 -ffast-math
-fvisibility=hidden -fno-strict-aliasing -fPIC -D_GNU_SOURCE -DPTHREADS
-DHAVE_POSIX_MEMALIGN -DUSE_XSHM -std=gnu99 -fvisibility=hidden -DHAVE_STDINT_H
-DHAVE_SYS_TYPES_H svga_tgsi_insn.c -o svga_tgsi_insn.o
svga_tgsi_insn.c: In function 'svga_shader_emit_instructions':
svga_tgsi_insn.c:2969:1: internal compiler error: in push_minipool_fix, at
config/arm/arm.c:12084
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make[4]: *** [svga_tgsi_insn.o] Error 1

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>