Fix building on osx

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

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

rebase

Fix inline asm in dscal: mark x, x1 as clobbered. Fixes #2408

The leaq instructions in dscal_kernel_inc_8 modify x and x1 so they
must be declared as input/output constraints, otherwise the compiler
may assume the corresponding registers are not modified.

Patch out instances of Z15 in dynamic_zarch.c

Fix typo in dynamic_zarch.c

Fix spurious application of USE_TRMM in cmake builds

Fix coretype identification of Intel Cannon Lake, Ice Lake and Goldmont

Avoid printing the following information on mips and mips64 when check msa

Make BUFFER_SIZE configurable at build time

There does not appear to be a Z15 kernel yet, causing link errors from the code. This patch fixes the issue.

affecting Goldmont, Cannon Lake, Ice Lake autodetection

"unrecognized command line option ‘-mmsa’"

rebase

Update Changelog with changes from 0.3.8

rebase