Do not enable VTE support if libvte is around

Index: configure.in
--- configure.in.orig
+++ configure.in
@@ -1075,27 +1075,7 @@ AC_SUBST(MOSH_OCB_OBJ)
 AC_SUBST(PROTOBUF_CFLAGS)
 AC_SUBST(PROTOBUF_LIBS)
 
-if test "${have_gtk}" = "yes" ; then
-	if test "${gtk_version}" = "3.0" ; then
-		PKG_CHECK_MODULES(VTE, vte-2.91, have_vte=yes, have_vte=no)
-		if test "$have_vte" = "yes" ; then
-			VTE_ABI=2.91
-		else
-			PKG_CHECK_MODULES(VTE, vte-2.90, have_vte=yes, have_vte=no)
-			if test "$have_vte" = "yes"; then
-				VTE_ABI=2.90
-			fi
-		fi
-	else
-		PKG_CHECK_MODULES(VTE, vte, have_vte=yes, have_vte=no)
-	fi
-	if test "$have_vte" = "yes" ; then
-		OUTPUT_FILES="gtk/Makefile ${OUTPUT_FILES}"
-		AC_SUBST(VTE_ABI)
-	fi
-else
-	have_vte=no
-fi
+have_vte=no
 
 if test "$image" = "yes"; then
 	tools="mlclient,mlconfig,mlcc,mlterm-menu,mlimgloader,registobmp,mlfc"
