Move stdarg.h to common-defs.h

Move stdarg.h to common-defs.h

This commit moves the inclusion of stdarg.h to common-defs.h and
removes all other inclusions.

gdb/
2014-08-07  Gary Benson  <gbenson@redhat.com>

	* common/common-defs.h: Include stdarg.h.
	* defs.h: Do not include stdarg.h.
	* ada-lang.c: Likewise.
	* common/common-utils.h: Likewise.
	* guile/scm-string.c: Likewise.
	* guile/scm-utils.c: Likewise.
	* m32c-tdep.c: Likewise.

gdb/gdbserver/
2014-08-07  Gary Benson  <gbenson@redhat.com>

	* server.h: Do not include stdarg.h.
	* nto-low.c: Likewise.