cwen 9d759c4e38 vbam: various !x86 fixes:
- limit the use of an asm optimisation for `std::sqrt()' to x86 archs,
since it breaks the build everywhere else.
- remove `-fopenmp' for base-gcc archs; it breaks the build on them
- remove `-Wno-c++11-narrowing' from CXXFLAGS; no occurrence of it has
been found, and such warning is notably useful for arm* and powerpc.
Tested on sparc64 (kmos@), macppc and amd64 (me).

OK kmos@
2019-11-17 00:14:36 +00:00
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