set CPU/FPU specific build flags
changed build flags
Makefile: remove -ffast-math build flag; compile modules with same fl…
…ags as kernel

-ffast-math can cause some troube, cf.
http://forum.xda-developers.com/showthread.php?t=2228581
add & enable graphite and link time optimiaztions
update optimizations
compile with ccache
ffast math flags
hardfloat vfp flags