[Mesa-dev] configure fails to find llvm since recent llvm commit.

[Andy Furniss]

Don't know if mesa needs changing or it's an llvm needs fixing issue, 
but since llvm commit

commit 78fbc18aed8024139cb87c5db69ab5b43dc615d6
Author: Rafael Espindola <rafael.espindola at gmail.com>
Date:   Fri Jun 30 18:48:33 2017 +0000

     Completely disable git/svn version checking if not needed.

     Working with git on a branch I find it really annoying that committing
     a change causes ninja to think that stuff needs to be rebuilt.

     With this change at least nothing in llvm needs to be rebuild when
     something is committed.

     git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306858 
91177308-0d34-0410-b5e6-96231b3b80d8

configuring mesa bails after failing to find llvm shared libs (and gives 
outdated suggestion). Shared libs are installed.

checking for AMDGPU... yes
configure: error: Could not find llvm shared libraries:
         Please make sure you have built llvm with the --enable-shared 
option
         and that your llvm libraries are installed in /usr/lib
         If you have installed your llvm libraries to a different 
directory you
         can use the --with-llvm-prefix= configure flag to specify this 
directory.
         NOTE: Mesa is attempting to use llvm shared libraries by default.
         If you do not want to build with llvm shared libraries and 
instead want to
         use llvm static libraries then add --disable-llvm-shared-libs 
to your configure
         invocation and rebuild.