gdbsupport: Fix config.status dependency

Commit 171fba11ab27 ("Make GDBserver abort on internal error in development mode")
created a new substitution CONFIG_STATUS_DEPENDENCIES but this is used by
Makefile.in (which is not regenerated by that commit).  After regenerating
it, it is found that CONFIG_STATUS_DEPENDENCIES value is not valid, making
gdbsupport fail to build.

Since the CONFIG_STATUS_DEPENDENCIES value is used in the Makefile, macro
substitution must have a Makefile format but commit 171fba11ab27 used shell
format "$srcdir/../bfd/development.sh".

This commit fixes this issue by substituting "$srcdir" (shell format) to
"$(srcdir)" (Makefile format).  It preserves the dependency as Pedro
intended and fixes the build problem.

It also regenerates corresponding files with the maintainer mode.

gdbsupport/ChangeLog:

	* configure.ac: Fix config.status dependency.
	* Makefile.in: Regenerate.
	* configure: Regenerate.