Hard-code argv[0] for gtk_init() to "emacs"

This ensures that gtk sets the WM_CLASS to Emacs not Emacs-gtk or similar since
it also uses the value of argv[0] when choosing this. Should completely resolve
issue #83.

Signed-off-by: Alex Murray <murray.alex@gmail.com>

emacs-name.patch

@@ -11,3 +11,16 @@ index 712826d57b7..ed8e8d8e624 100644
    Vinvocation_directory = Ffile_name_directory (raw_name);
 
    /* If we got no directory in argv[0], search PATH to find where
+diff --git a/src/xterm.c b/src/xterm.c
+index 524e2a32574..22d319c5999 100644
+--- a/src/xterm.c
++++ b/src/xterm.c
+@@ -29489,6 +29489,6 @@ x_term_init (Lisp_Object display_name, char *xrm_option, char *resource_name)
+           argv[argc] = 0;
+
+         argc = 0;
+-        argv[argc++] = initial_argv[0];
++        argv[argc++] = "emacs";
+
+         if (! NILP (display_name))
+           {