[gtk-osx] Make bison depend on flex.

[John Ralls <jralls src gnome org>]

commit c9ba1cd1a082a5f87b50ea041708cf6a0dea9540
Author: John Ralls <jralls ceridwen us>
Date:   Tue Aug 1 11:05:35 2017 +0200

    Make bison depend on flex.

 modulesets-stable/bootstrap.modules |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/modulesets-stable/bootstrap.modules b/modulesets-stable/bootstrap.modules
index 2af2403..1228750 100644
--- a/modulesets-stable/bootstrap.modules
+++ b/modulesets-stable/bootstrap.modules
@@ -144,6 +144,9 @@
   <autotools id="bison" autogen-sh="configure">
     <branch repo="ftp.gnu.org" module="bison/bison-3.0.4.tar.xz"
             version="3.0.4"/>
+    <dependencies>
+      <dep package='flex'/>
+    </dependencies>
   </autotools>
   
   <!-- MacOS hasn't updated flex since 2012. Since it's BSD-licensed