corrected test for libXmu for some systems; added test for difftime

* configure.in: corrected test for libXmu for some systems; added test for
difftime

* app/main.c: use glib ATEXIT macro

* app/text_tool.c: applied gimp-stric-980321-0 (text preview refresh)

* plug-ins/script-fu/script-fu-console.c: don't need to init gtkpreview stuff,
since we don't use them

* plug-ins/script-fu/*: many portability fixes

* plug-ins/pnm/pnm.c: sprintf portability patch

* plug-ins now #define RAND_MAX if needed

* plug-ins/sparkle/sparkle.c: applied gimp-joke-980322-1

-Yosh

plug-ins/script-fu/script-fu.c

@@ -26,6 +26,8 @@
 #include "script-fu-scripts.h"
 #include "script-fu-server.h"
 
+extern FILE *siod_output;
+
 /* External functions
  */
 extern void gimp_extension_process (guint timeout);
@@ -163,6 +165,8 @@ run (char    *name,
      int     *nreturn_vals,
      GParam **return_vals)
 {
+  siod_output = stdout;
+
   /*  Determine before we allow scripts to register themselves
    *   whether this is the base, automatically installed script-fu extension
    */