Similar to the situation on sparc64.

To reproduce:
- install gtk4 build-dependencies on powerpc porterbox with no access to a
  real GPU
- get gtk4 source
- edit debian/rules to remove the special case that forces use of softpipe
  on powerpc
- build and run tests

Expected result: either of these:
- llvmpipe exists, is used, and works
- llvmpipe doesn't exist and softpipe is automatically used instead

Actual result:
- all tests that use OpenGL fail with message "LLVM ERROR: Relocation
  type not implemented yet!" and a SIGABRT

I would suggest special-casing llvmpipe (and anything else requiring LLVM
JIT: lavapipe?) to be built on most of the $(LLVM_ARCHS), but not powerpc.

    smcv

I currently do not have a powerpc machine to test,but I could test it using
QEMU's powerpc emulation.

And for those who don't know softpipe and LLVMPipe (unlikely)

Softpipe:Software rasterizer with no LLVM,compliant with OpenGL 3.3,slow
LLVMpipe:Software rasterizer accelerated with LLVM,compliant with OpenGL
4.5,fast

That's how it works.

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