glibc: do not pass -DSHARED to any of the libc_nonshared.a sources

This essentially reverts 6a12dce207114842e2e49a3aeb18af01ab207f0b but it
leaves breadcrumbs in the source explaining why things are the way they
are.
9257669cd4Andrew Kelley committed on 12/16/2021, 10:34:20 AMparent1b0be5c
1 file changedLine totals unavailable