[glib] Update building docs to mention mandatory threads

[Ryan Lortie <ryanl src gnome org>]

commit 3534ff418c85481d245631abb06e89b8898790f4
Author: Ryan Lortie <desrt desrt ca>
Date:   Wed Aug 31 16:43:15 2011 -0400

    Update building docs to mention mandatory threads
    
    The docs used to say thread support was optional -- it's mandatory now.

 docs/reference/glib/building.sgml |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/docs/reference/glib/building.sgml b/docs/reference/glib/building.sgml
index 1ab30d2..23a8afa 100644
--- a/docs/reference/glib/building.sgml
+++ b/docs/reference/glib/building.sgml
@@ -144,10 +144,9 @@ How to compile GLib itself
       </listitem>
       <listitem>
 	<para>
-	  A thread implementation is needed, unless you want to compile GLib
-	  without thread support, which is not recommended. The thread support
-	  in GLib can be based upon several native thread implementations,
-	  e.g. POSIX threads, DCE threads or Solaris threads.
+	  A thread implementation is needed. The thread support in GLib
+	  can be based upon several native thread implementations, e.g.
+	  POSIX threads, DCE threads or Solaris threads.
 	</para>
       </listitem>
       <listitem>