c-common.c: Define all C/ObjC/C++ warning and flag variables.

c-common.c: Define all C/ObjC/C++ warning and flag variables.

	* c-common.c: Define all C/ObjC/C++ warning and flag variables.
	* c-common.h: Declare all C/ObjC/C++ warning and flag variables.
	* c-decl.c: Move all warning and flag variables to c-common.c.
	* c-format.c: Move all warning variables to c-common.c.
	* c-tree.h: Move all warning and flag declarations to c-common.h.
	* objc/objc-act.c: Move all warning variables to c-common.c.
	(flag_warn_protocol): Rename warn_protocol.
cp:
	* cp-tree.h: Move all warning and flag declarations to c-common.h.
	* decl.c: Move all warning and flag variables to c-common.c.
	* decl2.c: Move all warning and flag variables to c-common.c.
	* lex.c (flag_digraphs): Remove.
	(warn_traditional): Now in c-common.c.

From-SVN: r55923