* emultempl/astring.sed: New file.
* Makefile.am (stringify.sed): New target.
(GEN_DEPENDS): Change $(srcdir)/emultempl/stringify.sed to
stringify.sed.
* configure.in: Define and substitute STRINGIFY.
* emultempl/*.em: Use stringify.sed from build directory rather
than source directory.
* emultempl/elf32.em: Use stringify.sed rather than inline sed
script.
* emultempl/gld960.em, emultempl/gld960c.em: Likewise.
* emultempl/hppaelf.em, emultempl/linux.em: Likewise.
* emultempl/lnk960.em, emultempl/sunos.em: Likewise.
* configure, Makefile.in: Rebuild.