remove scm version and dirty tag
fs/fs-writeback: fix ICE with gcc4.7 and -O3

fs/fs-writeback.c: In function 'bdi_writeback_thread':
fs/fs-writeback.c:991:1: internal compiler error: in push_minipool_fix, at config/arm/arm.c:13055
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://source.android.com/source/report-bugs.html> for instructions.
make[1]: *** [fs/fs-writeback.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [fs] Error 2
Makefile: build -O3
Makefile: use linaro 4.9 cortex-a9 optimized toolchain

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