Fixed problems with old gimp versions.

src/xscanimage.c

@@ -60,6 +60,8 @@
 
 #ifdef HAVE_LIBGIMP_GIMP_H
 
+#include <libgimp/gimp.h>
+
 # ifdef HAVE_LIBGIMP_GIMPFEATURES_H
 #  include <libgimp/gimpfeatures.h>
 # else
@@ -78,8 +80,6 @@
 #  include "xscanimage-gimp-1_0-compat.h" 
 # endif
 
-#include <libgimp/gimp.h>
-
 static void query (void);
 static void run (char *name, int nparams, GimpParam * param,
 		 int *nreturn_vals, GimpParam ** return_vals);