(libfetish_a_SOURCES): Remove fnmatch_.h.

(libfetish_a_SOURCES): Remove fnmatch_.h.
(lib_OBJECTS): New macro, for convenience when cutting and
pasting Makefile.am templates from gnulib.
(EXTRA_DIST): Remove fnmatch_loop.c.
(BUILT_SOURCES): Append $(FNMATCH_H).

Import the following changes from gnulib templates
for alloca and fnmatch):
(all-local $(lib_OBJECTS)): New dependencies.
(alloca.h): Use alloca.h-t for temporary.
(EXTRA_DIST): Append fnmatch_.h, fnmatch_loop.c.
(fnmatch.h): New rule.
(MOSTLYCLEANFILES): Add fnmatch.h, fnmatch.h-t.
(DISTCLEANFILES): Remove fnmatch.h