- Add support for gcc8/9 building (jsc#SLE-8604).

Note: this submission backports a change submitted to openSUSE:Factory.
It doesn't introduce any functional change for SLE-15, it is to keep things
in sync for Leap - and to ship missing flavors on PH.

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- Update to version 0.3.7 (jsc#SLE-8492)
  common:
    * having the gmake special variables TARGET_ARCH or TARGET_MACH
      defined no longer causes build failures in ctest or utest
    * defining NO_AFFINITY or USE_TLS to zero in gmake builds
      no longer has the same effect as setting them to one
    * a new test program was added to allow checking the library for thread safety
    * a new option USE_LOCKING was added to ensure thread safety
      when OpenBLAS itself is built without multithreading but
    * will be called from multiple threads.
    * a build failure on Linux with glibc versions earlier than 2.5 was fixed
    * a runtime error with CPU enumeration (and NO_AFFINITY not set)
      on glibc 2.6 was fixed
    * NO_AFFINITY was added to the CMAKE options
      (and defaults to being active on Linux, as in the gmake builds)
  x86_64
    * the build-time logic for detection of AVX512 availability
      in the processor and compiler was fixed
    * gmake builds on OSX now set the internal name
      of the library to libopenblas.0.dylib (consistent with CMAKE)
    * the Haswell DGEMM kernel received a significant speedup
      through improved prefetch and load instructions
    * performance of DGEMM, DTRMM, DTRSM and ZDOT on Zen/Zen2
      was markedly increased by avoiding vpermpd instructions
    * the SKYLAKEX (AVX512) DGEMM helper functions have now been
      disabled to fix remaining errors in DGEMM, DSYMM and DTRMM
  POWER:
    * added support for building on FreeBSD/powerpc64 and FreeBSD/ppc970
    * added optimized kernels for POWER9 single and double precision complex BLAS3
    * added optimized kernels for POWER9 SGEMM and STRMM

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initialize package

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