Flymake's flymake-proc.el parses column numbers from gcc/javac errors

Flymake's flymake-proc.el parses column numbers from gcc/javac errors

Column numbers are not a great way of marking diagnostic regions, but
that's probably all that can be expected from the flymake-proc.el
backend.  For now, try (end-of-thing 'sexp) to discover the
diagnostic's end position.

* lisp/progmodes/flymake-proc.el ()
(flymake-proc-err-line-patterns): Also parse column numbers,
if available, for gcc/javac warnings.