[Bug target/58446] Support for musl libc

[gcc-bug-espfv4bhi9 at gregor dot im]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58446

--- Comment #2 from Gregor Richards <gcc-bug-espfv4bhi9 at gregor dot im> ---
Created attachment 30831
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30831&action=edit
gcc_cv_target_dl_iterate_phdr=yes on musl (note that due to a bug in making
these .diffs, the configure.ac change is in libssp.diff ...)