add -Wold-style-declaration

add -Wold-style-declaration

This adds -Wold-style-declaration to gdb's list of warnings.

It turns out that a few places use "const static" rather than
"static const".  The former is deprecated according to the C standard.

Tested by rebuilding with --enable-targets=all on x86-64 Fedora 18.

	* configure.ac (build_warnings): Add -Wold-style-declaration.
	* configure: Rebuild.
	* dsrec.c (make_srec): Use "static const", not "const static".
	* h8300-tdep.c (h8300_breakpoint_from_pc): Use "static const",
	not "const static".
	* mi/mi-parse.c (mi_no_values, mi_simple_values, mi_all_values):
	Use "static const", not "const static".
	* mn10300-tdep.c (mn10300_breakpoint_from_pc): Use "static const",
	not "const static".
	* moxie-tdep.c (moxie_breakpoint_from_pc): Use "static const",
	not "const static".
	* rs6000-tdep.c (rs6000_breakpoint_from_pc): Use "static const",
	not "const static".
	* v850-tdep.c (v850_breakpoint_from_pc): Use "static const",
	not "const static".
	(v850_dbtrap_breakpoint_from_pc): Likewise.
	* xstormy16-tdep.c (xstormy16_breakpoint_from_pc): Use "static const",
	not "const static".