Move gravity_works back to a static global variable, since it is a global

Move gravity_works back to a static global variable, since it is a global

Wed Jan 27 23:05:55 1999  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtklayout.[ch] (gtk_layout_realize): Move
	gravity_works back to a static global variable,
	since it is a global constant, and this way we
	keep structure sizes uniform.

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