Apply only the libadd/libnames part of
dbf05458e3bd
Add libz to the dependencies for libdwarf. Otherwise, building older
branches on recent -CURRENT might fail in the cross-tools stage with:
ld: error: undefined symbol: uncompress
>>> referenced by libdwarf_elf_init.c:233 (/usr/src/contrib/elftoolchain/libdwarf/libdwarf_elf_init.c:233)
>>> libdwarf_elf_init.o:(_dwarf_elf_init) in archive /usr/lib/libdwarf.a
Direct commit to stable/13, since
dbf05458e3bd has other libdwarf
changes to support compressed ELF sections, which are more intrusive.