Try another buildfix.
Merge pull request #3 from Vproject/buildfix

Try another buildfix.
added basic .gitignore for executable and object files
use the standard __SSE2__ define to automatically enable SSE2 support where available
First attempts of optimizing motion search for ARM processors. This uses a very handy SIMD32 instruction for computing error scores. Enable by defining ARMSIMD32. Brings profile footprint of motion search down from ~23% to ~16% on my Raspberry Pi.
in ARMSIMD32, use "offsets" to pointers instead of incrementing them. This is more compact and closer to the code actually emitted.