Connect new libgcc_eh and libgcc_s to the build

[emaste]

Summary

exp-run will be requested before commit

[ed]

lib/Makefile

169

The rest of this Makefile uses .if ${MK_*} != "no". Is one method preferred over the other?

[emaste]

lib/Makefile

169

I think SUBDIR.${MK_*} is preferred, but I suspect lib/Makefile was not converted because it has some more complex cases other than just ${MK_*} != "no".

I posted D8246 to convert the simple cases to SUBDIR.${MK_*}

[emaste]

Rebase after rS307243

[emaste]

Exp-run requested in PR 213480

[emaste]

• rebase on D8301
• in gnu/lib/Makefile exclude gnu/lib/libgcc subdir under WITH_LLVM_LIBUNWIND

[brooks]

LGTM