Better optimized ICC release flags
Add those flags included in -fast which both helps performance
and are appropriate for GROMACS.
The flags included in -fast for Linux we weren't using were:
-ipo, -no-prec-div, -static, -fimf-domain-exclusion=15
Full static depends on static libraries to be installed and thus
will not always work. IPO increases compile time by a huge factor.
We do require that extreme values (e.g. large negative arguments
to exp and large positive to erfc) are computed correctly.
This leaves -no-prec-div -fimf-domain-exclusion=14 -static-intel
as safe and useful flags for GROMACS.
Change-Id: Ifbee69431841e3051c95f0b4c0ad204aac965c4e