Attempt to fix build on GCC-based systems by disabling -march=native,
which should never be set on the FreeBSD package building cluster
whatsoever:

g++9: error: unrecognized command line option '-march=native'; did you mean '-mcpu=native'?

Unfortunately this is necessary but not sufficient for powerpc64:

/wrkdirs/usr/ports/math/ogdf/work/OGDF/src/ogdf/basic/System.cpp:78:11: fatal error: cpuid.h: No such file or directory

Approved by: portmgr (tier-2 blanket)