[vte] build: Don't define GDK_MULTIHEAD_SAFE

[Christian Persch <chpe src gnome org>]

commit 659d64b76f89790eb4453effb9c31d66b4a119be
Author: Christian Persch <chpe gnome org>
Date:   Fri Mar 4 17:59:32 2016 +0100

    build: Don't define GDK_MULTIHEAD_SAFE

 configure.ac |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9c1106f..2a8d922 100644
--- a/configure.ac
+++ b/configure.ac
@@ -255,8 +255,6 @@ AM_CONDITIONAL([WITH_PCRE2],[test "$with_pcre2" = "yes"])
 
 # GLIB tools
 
-AC_DEFINE(GDK_MULTIHEAD_SAFE,1,[Force use of GDK multihead-safe APIs.])
-
 AC_PATH_PROG([GLIB_GENMARSHAL],[glib-genmarshal])
 AC_PATH_PROG([GLIB_MKENUMS],[glib-mkenums])