Bug#954849: Bug #954849 :does not start: LLVM ERROR: inconsistency in registered CommandLine options

["K.Ohta" <whatisthis.sowhat@gmail.com>]

Hello,

 This issue happened with mesa-opencl-icd 20.1.8-1,
 but with 20.2.0-rc4-2 with cherrypicking install(^_^;, 
 this issue doesn't happen.
 
 This seems to be differ of linked libllvm,
 recent of v20.1.x links llvm10 and libclc,
 but recent libclc links llvm11 :-(

 But, with 20.2.x, links llvm11 and libclc.

 So, with mesa20.1.x conflicts version of llvm/clang,
 with mesa20.2.x does not conflict. 

Please check more for my inference.

Regards,
Ohta.