getprogname: port to IRIX * lib/getprogname.c (getprogname): Port to IRIX. Based on an idea by Bastien Roucariès at: http://lists.gnu.org/archive/html/bug-gnulib/2010-12/msg00096.html via code from Bruno Haible at: https://lists.gnu.org/archive/html/bug-gnulib/2010-12/msg00249.html