8372977: Unnecessary gthread-2.0 loading

Reviewed-by: rschmelter
Backport-of: 5ea2b64

Author: GoeLin

src/java.desktop/unix/native/libawt_xawt/awt/gtk3_interface.c

@@ -42,7 +42,6 @@
 #include "debug_assert.h"
 
 static void *gtk3_libhandle = NULL;
-static void *gthread_libhandle = NULL;
 
 static void transform_detail_string (const gchar *detail,
                                      GtkStyleContext *context);
@@ -79,15 +78,6 @@ static void* dl_symbol(const char* name)
     return result;
 }
 
-static void* dl_symbol_gthread(const char* name)
-{
-    void* result = dlsym(gthread_libhandle, name);
-    if (!result)
-        longjmp(j, NO_SYMBOL_EXCEPTION);
-
-    return result;
-}
-
 gboolean gtk3_check(const char* lib_name, gboolean load)
 {
     if (gtk3_libhandle != NULL) {
@@ -264,13 +254,6 @@ GtkApi* gtk3_load(JNIEnv *env, const char* lib_name)
         return FALSE;
     }
 
-    gthread_libhandle = dlopen(GTHREAD_LIB_VERSIONED, RTLD_LAZY | RTLD_LOCAL);
-    if (gthread_libhandle == NULL) {
-        gthread_libhandle = dlopen(GTHREAD_LIB, RTLD_LAZY | RTLD_LOCAL);
-        if (gthread_libhandle == NULL)
-            return FALSE;
-    }
-
     if (setjmp(j) == 0)
     {
         fp_gtk_check_version = dl_symbol("gtk_check_version");
@@ -637,9 +620,6 @@ GtkApi* gtk3_load(JNIEnv *env, const char* lib_name)
         dlclose(gtk3_libhandle);
         gtk3_libhandle = NULL;
 
-        dlclose(gthread_libhandle);
-        gthread_libhandle = NULL;
-
         return NULL;
     }
 
@@ -738,7 +718,6 @@ static int gtk3_unload()
 
     dlerror();
     dlclose(gtk3_libhandle);
-    dlclose(gthread_libhandle);
     if ((gtk3_error = dlerror()) != NULL)
     {
         return FALSE;