Attached is a patch to update testing/openblas to 0.2.17.

This required replacing one use of sys_siglist[] with strsignal().

Also, due to some convolutions of the build system, setting CFLAGS in
the environment rather than passing it to make caused repeated definitions
of CNAME/ASMNAME/ASMFNAME/... in the gcc invocation, making for a very
noisy build.

Thanks,
Isaac Dunham