emacs: Fix the smalltalk-mode mode for emacs 24.2 and later

In emacs-24.2 The inhibit-first-line-modes-regexps variable was
renamed to inhibit-local-variables-regexps.

2013-06-14  Jochen Schmitt  <Jochen@herr-schmitt.de>

	* smalltalk-mode-init.el.in: Use inhibit-local-variables-regexps
	if it is available.