Add proper defaults for the IxMIN/IxMAX kernels on mips64 and power

the fallbacks from Makefile.L1 assume a combined source for absolute value and non-absolute (with ifdef USE_ABS) but here we have separate implementations

the fallbacks from Makefile.L1 assume a combined source for absolute value and non-absolute (with ifdef USE_ABS) but here we have separate implementations

rebase

Fix handling of ppc endianness

rebase

Fix install name on osx again

Nightly homebrew check

Fix ISMIN and ISMAX kernel choices for POWER8

to fix utest failure in new ismin test -  Makefile.L1 defaults look wrong

Also, add comments to clarify what the test is testing

Fix building on osx

rebase

Fix iamax sse implementation and add utests

The was a typo in iamax_sse.S where one of the comparison
was cmpeqps instead of cmpeqss. That misdetected index
for sequences where the minimum value was 0.

Restore -march flag for Android builds

fixes #2419 - renewed discussion in #2112 suggests removal of the option was primarily aimed at non-Android builds

rebase

Make ctest verbose for drone

Add CMake related files to .gitignore.

Correct generation of GETRF files by the CMAKE build

fixes #2396

Fix pre-processed POWER8 codes and wrong conditionals in the POWER8,PPC440 and PPC970 KERNEL files