[GRASS-git] [OSGeo/grass] 01f6a2: configure: Improve OpenMP detection (#2692)

[Nicklas Larsson]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: 01f6a2b755434b2bcfee7d2f87cfef9c27206d7c
      https://github.com/OSGeo/grass/commit/01f6a2b755434b2bcfee7d2f87cfef9c27206d7c
  Author: Nicklas Larsson <n_larsson at yahoo.com>
  Date:   2023-01-15 (Sun, 15 Jan 2023)

  Changed paths:
    M aclocal.m4
    M configure
    M configure.ac
    M include/Make/Grass.make
    M include/Make/Platform.make.in
    M lib/gmath/Makefile
    M lib/gmath/test/Makefile
    M lib/gpde/Makefile
    M lib/gpde/test/Makefile
    M lib/rst/interp_float/Makefile
    M lib/temporal/lib/Makefile
    M raster/r.mfilter/Makefile
    M raster/r.neighbors/Makefile
    M raster/r.patch/Makefile
    M raster/r.proj/Makefile
    M raster/r.resamp.filter/Makefile
    M raster/r.resamp.interp/Makefile
    M raster/r.series.accumulate/Makefile
    M raster/r.series/Makefile
    M raster/r.sim/r.sim.sediment/Makefile
    M raster/r.sim/r.sim.water/Makefile
    M raster/r.sim/simlib/Makefile
    M raster/r.slope.aspect/Makefile
    M raster/r.sun/Makefile
    M raster/r.univar/Makefile
    M vector/v.surf.rst/Makefile

  Log Message:
  -----------
  configure: Improve OpenMP detection (#2692)

Add detection of -lomp in addition to -lgomp, this also adds
detection of Clang on Apple with "-Xclang -fopenfp".