Bump minimum GTK versions to 2.24 and 3.10

* configure.ac: Bump required GTK 2 and GTK 3 versions and the
associated GLib versions. Remove obsolete AC_CHECK_FUNCS calls. These
check for functions available in later GTK 2 versions. These checks
and can safely be removed with the exception of
gtk_window_set_has_resize_grip, which according to a comment in
gtkutil.c causes an issue in Ubuntu's GTK 2.

* src/gtkutil.c:
* src/xfns.c:
* src/xterm.c:
* src/xterm.h: Remove now unused conditional blocks. Use HAVE_GTK3
instead of GTK_CHECK_VERSION where now applicable. Remove checks of
now always true USE_GTK_TOOLTIP.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/xterm.c b/src/xterm.c
index def6915d62e..b9f4a1fc303 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -12514,7 +12514,7 @@ x_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
 
         dpy = DEFAULT_GDK_DISPLAY ();
 
-#if ! GTK_CHECK_VERSION (2, 90, 0)
+#ifndef HAVE_GTK3
         /* Load our own gtkrc if it exists.  */
         {
           const char *file = "~/.emacs.d/gtkrc";