math/openblas: update to 0.2.8
- Update to 0.2.8 
- Convert perl5 and gmake to USES
- This port uses gcc 4.6+ and gfortran
- Remove now useless MAKE_JOBS_SAFE
Submitted by: Eijiro Shibusawa <phd_kimberlite yahoo.co.jp> (maintainer)
(Only the first 10 of 16 ports in this commit are shown above. )
Add an math/openblas.
OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version.
OpenBLAS is an open source project supported by
Lab of Parallel Software and Computational Science, ISCAS.
NOTE: If you want to specify your CPU microarchitecture manually,
please use TARGET_CPU_ARCH knob, e.g., "make TARGET_CPU_ARCH=NEHALEM".
This value is set TARGET build flag.
Submitted by: Eijiro Shibusawa <email@example.com>