Check for mmap.

* configure.in: Check for mmap.

	* app/makefile.msc: Depend on gimpi.lib.

	* app/app_procs.c (app_init): Fix gccism: Allocate filenames (an
 	array with non-constant size) dynamically.

	* app/{datafiles,fileops,general,install,module_db,temp_buf}.c:
 	Include glib.h before standard headers, because of certain obscure
 	details related to compiling with gcc on Win32.

	(If you really want to know: glib.h defines he names of POSIXish
	(but non-ANSI) functions as prefixed with underscore, because
 	that's how they are named in the msvcrt runtime C library we want
 	to use. However, defining stat as _stat causes some problems if
 	done after including the mingw32 <sys/stat.h>. So, it's easiest to
 	include <glib.h> early.)

	* app/main.c: Use _stdcall and __argc, __argv with MSC, but
 	__attribute__((stdcall)) and _argc, _argv with gcc. Don't print
 	the "Passed serialization test" message on Win32. (It would open
 	up an otherwise unnecessary console window.)

	* app/paint_funcs.c (gaussian_blur_region): Don't use variable sum
 	until initialized.

	* app/{bezier_select,paths_dialog}.c: Include config.h and define
 	rint() if necessary.

	* app/plug_in.c: Use _spawnv, not spawnv, on Win32 and OS/2.

libgimpbase/gimpdatafiles.c

@@ -20,6 +20,8 @@
  */
 #include "config.h"
 
+#include <glib.h>
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -42,7 +44,6 @@
 #endif
 #endif
 
-#include <glib.h>
 #include "datafiles.h"
 #include "errors.h"
 #include "general.h"