remove now useless and deprecated g_thread_init

Warning

g_thread_init has been deprecated since version 2.32 and should not be used in newly-written code. This function is no longer necessary. The GLib threading system is automatically initialized at the start of your program.

app/main.c

@@ -322,8 +322,6 @@ main (int    argc,
 #endif
 #endif
 
-  g_thread_init (NULL);
-
 #ifdef GIMP_UNSTABLE
   gimp_open_console_window ();
 #endif

app/tests.c

@@ -95,7 +95,6 @@ gimp_init_for_gui_testing_internal (gboolean     show_gui,
   Gimp                 *gimp;
 
   /* from main() */
-  g_thread_init(NULL);
   g_type_init();
   gimp_log_init ();
 

app/tests/test-core.c

@@ -229,7 +229,6 @@ main (int    argc,
   Gimp *gimp;
   int   result;
 
-  g_thread_init (NULL);
   g_type_init ();
   g_test_init (&argc, &argv, NULL);
 

app/tests/test-xcf.c

@@ -970,7 +970,6 @@ main (int    argc,
   Gimp *gimp;
   int   result;
 
-  g_thread_init (NULL);
   g_type_init ();
   g_test_init (&argc, &argv, NULL);
 

plug-ins/common/file-pdf-load.c

@@ -352,9 +352,6 @@ run (const gchar      *name,
   values[0].type          = GIMP_PDB_STATUS;
   values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
 
-  if (! g_thread_supported ())
-    g_thread_init (NULL);
-
   if (strcmp (name, LOAD_PROC) == 0)
     {
       PdfSelectedPages pages = { 0, NULL };

plug-ins/help-browser/help-browser.c

@@ -129,9 +129,6 @@ run (const gchar      *name,
 
   INIT_I18N ();
 
-  if (! g_thread_supported ())
-    g_thread_init (NULL);
-
   switch (run_mode)
     {
     case GIMP_RUN_INTERACTIVE:

plug-ins/print/print.c

@@ -122,8 +122,6 @@ run (const gchar      *name,
   *nreturn_vals = 1;
   *return_vals  = values;
 
-  g_thread_init (NULL);
-
   values[0].type          = GIMP_PDB_STATUS;
   values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;