* dynl.c: Don't define stub procedures if DYNAMIC_LINKING is not

	* dynl.c: Don't define stub procedures if DYNAMIC_LINKING is not
	defined.  They don't do anything useful, especially since the
	only case where DYNAMIC_LINKING is undefined seems to be
	when --with-modules=no is given to configure, which is basically
	requesting that the "dynamic linking module" be omitted.

	* Makefile.am (libguile_la_SOURCES): move dynl.c from
	libguile_la_SOURCES to EXTRA_libguile_la_SOURCES.

	* extensions.c (load_extension): check DYNAMIC_LINKING for
	scm_dynamic_call.
	* init.c (scm_init_guile_1): check DYNAMIC_LINKING for
	scm_init_dynamic_linking.

	* configure.in: check dynamic linking before modules.  Add dynl.c
	if dynamic linking is available, i.e., unless --with-modules=no
	was given to configure.