libatomics-ops: force ARM mode

* otherwise ie spitz (armv5te) build fails with:
| make[3]: Entering directory `/OE/shr-core/tmp/work/armv5te-oe-linux-gnueabi/libatomics-ops-1.2-r5/libatomic_ops-1.2/src'
| arm-oe-linux-gnueabi-gcc  -march=armv5te  -mthumb -mthumb-interwork  -mtune=xscale --sysroot=/OE/shr-core/tmp/sysroots/spitz -DHAVE_CONFIG_H -I.    -fPIC -O
2 -pipe -g -feliminate-unused-debug-types -DNDEBUG -c atomic_ops.c
| arm-oe-linux-gnueabi-gcc  -march=armv5te  -mthumb -mthumb-interwork  -mtune=xscale --sysroot=/OE/shr-core/tmp/sysroots/spitz -DHAVE_CONFIG_H -I.    -fPIC -O
2 -pipe -g -feliminate-unused-debug-types -DNDEBUG -c atomic_ops_stack.c
| arm-oe-linux-gnueabi-gcc  -march=armv5te  -mthumb -mthumb-interwork  -mtune=xscale --sysroot=/OE/shr-core/tmp/sysroots/spitz -DHAVE_CONFIG_H -I.    -fPIC -O
2 -pipe -g -feliminate-unused-debug-types -DNDEBUG -c atomic_ops_malloc.c
| atomic_ops_malloc.c: In function 'msb':
| atomic_ops_malloc.c:223:2: warning: right shift count >= width of type [enabled by default]
| rm -f libatomic_ops_gpl.a
| ar cru libatomic_ops_gpl.a atomic_ops_stack.o atomic_ops_malloc.o
| arm-oe-linux-gnueabi-ranlib libatomic_ops_gpl.a
| {standard input}: Assembler messages:
| {standard input}:286: Error: selected processor does not support Thumb mode `swp r1,r2,[r3]'
| {standard input}:329: Error: selected processor does not support Thumb mode `swp r0,r1,[r3]'

* this is just work around, proper fix proposed by Henning Heinold
  hm we should think of reworking this recipe now. Because since gcc 4.5
  pulseaudio for arm can use the gcc internal atomicstuff and in oe-core
  and meta-oe we have 4.5 or 4.6 only. The lib is
  only needed for mips and it is still the old release, on cvs
  is a much better version, which supports thumb too, if
  remember correctly.

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

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