[mips][sparc] Opt out of runtimes build for compiler-rt

[DavidSpickett]

Summary

We don't know yet if they are compatible, and these are the
last bots without an explicit value here.

This will enable me to flip the default for ClangBuidler.

[DavidSpickett]

I still intend to help get these to the runtimes build, just unblocking the other work in the meantime.

[DavidSpickett]

ping!

[glaubitz]

Sorry, this somehow fell off the table. Fine by me for the time being.

[DavidSpickett]

https://github.com/llvm/llvm-zorg/commit/8c2be36f8bf4d46bbbe0205a3202b9708f906e8f

buildbot/osuosl/master/config/builders.py

# Clang builders.
 
     {'name' : "clang-mips64el-linux",
     'tags'  : ["clang"],
     'workernames' : ["debian-tritium-mips64el"],
     'builddir': "clang-mips64el-linux",
     'factory' : ClangBuilder.getClangCMakeBuildFactory(
                     clean=False,
                     checkout_lld=False,
+                    enable_runtimes=None,
                     useTwoStage=False,
                     stage1_config='Release',
                     extra_cmake_args=['-DLLVM_ENABLE_ASSERTIONS=ON',
                                       '-DLLVM_PARALLEL_LINK_JOBS=4',
                                       '-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON',
                                       '-DCMAKE_C_COMPILER_TARGET="mips64el-unknown-linux-gnu"',
                                       '-DLLVM_TARGETS_TO_BUILD=Mips'])},
 
# Clang builders.
 
     {'name' : "clang-sparc64-linux-multistage",
     'tags'  : ["clang"],
     'workernames' : ["debian-stadler-sparc64"],
     'builddir': "clang-sparc64-linux-multistage",
     'factory' : ClangBuilder.getClangCMakeBuildFactory(
                     clean=False,
                     checkout_lld=False,
+                    enable_runtimes=None,
                     useTwoStage=True,
                     stage1_config='Release',
                     stage2_config='Release',
                     extra_cmake_args=['-DLLVM_ENABLE_ASSERTIONS=ON',
                                       '-DLLVM_PARALLEL_LINK_JOBS=4',
                                       '-DLLVM_TARGETS_TO_BUILD=Sparc'])},
 
     ## LoongArch64 Clang+LLVM build check-all + test-suite