CMakeLists.txt: Properly handle cpu flags #533
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Having multiple cpu flags enabled is valid, so we should use if instead of elsif. Otherwise only the first
HAVE_*
variable is actually respected.e.g. before this change we get this on Gentoo:
i.e. only avx2 is respected, sse2/4 is ignored.
After change we get:
gentoo/sci#1143
Signed-off-by: Andrew Ammerlaan andrewammerlaan@gentoo.org