mips-elf-gcc: _libc_name_p missing

[rurban (Reini Urban)]

The mips-elf-gcc post fails on 15.6.0, cc 8.0.0 with _libc_name_p missing. mips-elf-gcc @3.4.6 (cross, devel), no variant

/usr/bin/clang -c   -Os -DLIBICONV_PLUG -DIN_GCC -DCROSS_COMPILE  -W -Wall -Wwrite-strin
gs -Wstrict-prototypes -Wmissing-prototypes -pedantic -Wno-long-long    -DHAVE_CONFIG_H -DGENERATOR_
FILE    -I. -I. -I/opt/local/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macport
s.org_macports_release_tarballs_ports_cross_mips-elf-gcc/mips-elf-gcc/work/gcc-3.4.6/gcc -I/opt/loca
l/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarb
alls_ports_cross_mips-elf-gcc/mips-elf-gcc/work/gcc-3.4.6/gcc/. -I/opt/local/var/macports/build/_opt
_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_cross_mips-elf
-gcc/mips-elf-gcc/work/gcc-3.4.6/gcc/../include -I../intl /opt/local/var/macports/build/_opt_local_v
ar_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_cross_mips-elf-gcc/mips-elf-gcc/work/gcc-3.4.6/gcc/fix-header.c -o fix-header.o
:info:build Undefined symbols for architecture x86_64:
:info:build   "_libc_name_p", referenced from:
:info:build       _nothrow_libfn_p in except.o
:info:build ld: symbol(s) not found for architecture x86_64