patch 9.0.0491: no good reason to build without the float feature

Problem:    No good reason to build without the float feature.
Solution:   Remove configure check for float and "#ifdef FEAT_FLOAT".
diff --git a/src/gui_gtk_x11.c b/src/gui_gtk_x11.c
index 21a6ed1..3cdf222 100644
--- a/src/gui_gtk_x11.c
+++ b/src/gui_gtk_x11.c
@@ -3598,7 +3598,7 @@
     {
 	gnome_program_init(VIMPACKAGE, VIM_VERSION_SHORT,
 			   LIBGNOMEUI_MODULE, gui_argc, gui_argv, NULL);
-# if defined(FEAT_FLOAT) && defined(LC_NUMERIC)
+# if defined(LC_NUMERIC)
 	{
 	    char *p = setlocale(LC_NUMERIC, NULL);