app/plug-in, app/gui: Fix initialization warnings

This patch moves two variables to prevent
warnings about variable creation mixing
with usage during build.

app/gui/splash.c

@@ -148,12 +148,12 @@ splash_create (Gimp         *gimp,
   GdkRectangle        workarea;
   gint                max_width;
   gint                max_height;
+  gboolean            release_splash;
 #ifdef G_OS_WIN32
   STARTUPINFO         StartupInfo;
 
   GetStartupInfo (&StartupInfo);
 #endif
-  gboolean            release_splash;
 
   g_return_if_fail (splash == NULL);
   g_return_if_fail (GDK_IS_MONITOR (monitor));

app/plug-in/gimpinterpreterdb.c

@@ -129,12 +129,14 @@ gimp_interpreter_db_new (gboolean verbose)
 static gboolean
 might_be_console_process (void)
 {
+  gboolean attached_to_self;
+
   /* check for Unix console */
   if (g_getenv ("TERM") || g_getenv ("SHELL"))
     return TRUE;
 
   /* check for Windows console (taken from gspawn-win32.c) */
-  gboolean attached_to_self = AttachConsole (GetCurrentProcessId ());
+  attached_to_self = AttachConsole (GetCurrentProcessId ());
   g_return_val_if_fail (! attached_to_self, TRUE);
 
   switch (GetLastError ())