dnl libltdl-supplied implementation (and default to do so
dnl on "known bad" systems). Could use a runtime check, but
dnl (a) detecting malloc issues is notoriously unreliable
dnl (b) only known system that declares argz functions,
dnl provides them, yet they are broken, is cygwin
dnl libltdl-supplied implementation (and default to do so
dnl on "known bad" systems). Could use a runtime check, but
dnl (a) detecting malloc issues is notoriously unreliable
dnl (b) only known system that declares argz functions,
dnl provides them, yet they are broken, is cygwin