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   split MKLLVM into MKLLVM and MKLLVMCMDS, like MKGCC and MKGCCCMDS:

   - only build clang or clang-tblgen if MKLLVMCMDS != "no"
   - move HAVE_MESA_VER earlier so we can detect mesa 18 and enable
     MKLLVM on platforms that need it
   - move the clang commands and headers into llvmcmds group
   - only build the clang specific LLVM libraries if MKLLVMCMDS != "no"

   much of this work came from maya@'s github commit
   f90685c11d4460d3098fa35f48b58d1893e974e0, reworked for HAVE_MESA_VER
   and llvmcmds vs MKCLANG.


   build tested on several platforms and on amd64 and i386 with several
   different build options (clang build, gcc build, gcc build with llvm
   libs).

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