Remove function wrongly on AWK Mode value of context fontification hook.

Remove function wrongly on AWK Mode value of context fontification hook.

* lisp/progmodes/cc-langs.el (c-before-context-fontification-functions):
swap order of entries so that awk's entry isn't superseded by the default.

* lisp/progmodes/cc-mode.el (c-before-context-fl-expand-region): Correct
to handle nil value of c-before-context-fontification-functions.