* plug-ins/FractalExplorer/Dialogs.c:
	* plug-ins/gfig/gfig.c:
	* plug-ins/gflare/gflare.c: Don't call gimp_plug_in_get_path(), since
	it doesn't really help, call gimp_gimprc_query() instead and display
	an error message in case of problem. Aka move the code from
	gimpmiscui back to these plug-ins.

	* libgimp/gimpmiscui.[ch]: removed these file.
	* libgimp/Makefile.am: changed accordlingly.

	* plug-ins/libgimpoldpreview/gimpoldpreview.c: removed
	gimp_plug_in_get_path() from here also, since I forgot to do this in
	my previous commits (ouch! bad DindinX!).

  All this partly close #125141.