Reference param spec when caching property values, since we unref it later

Reference param spec when caching property values, since we unref it later

Mon Apr  2 15:06:13 2001  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtkstyle.c (_gtk_style_peek_property_value): Reference
	param spec when caching property values, since we unref it
	later when we free the style.

	* gtk/gtkoptionmenu.c (gtk_option_menu_get_props): Dont' free
	values since they are retrieved with G_VALUE_NO_COPY_CONTENTS.