gcc disregard -fno-strict-aliasing flag

was causing problems for gcc 4.1, it's ok now
gcc Ofast option

enable to burn the cpu :) use -ffast-math
gcc use -march=native

to use all host CPU features, great speedups
gcc -pipe

may speed up our travis builds (uses pipes, instead of temp files during compilation)
gcc better debug symbols
Revert "gcc Ofast option"

This reverts commit a56e06ef3b4735362eec401099fd9311bf0fe1c2.

Conflicts:
	build_system/unix/Includes.am
add safe LDFLAGS

-Wl,-O1,--sort-common
Merge pull request #156 from breznak/optimizations

Optimizations