[gtkmm-documentation] Fix the build with --enable-warnings=fatal.

[Murray Cumming <murrayc src gnome org>]

commit a242ccb90c40156c3a6b3b715c96659b4197aa5c
Author: Murray Cumming <murrayc murrayc com>
Date:   Thu Dec 23 20:20:52 2010 +0100

    Fix the build with --enable-warnings=fatal.
    
    * configure.ac: Use -no-long-long to avoid an (apparently new) compiler
    warning about long long not being supported by C++98. glibmm already had
    this option, and now gtkmm does too.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 84a7da8..8ab77a0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,7 +27,7 @@ AC_CHECK_FUNCS([mkfifo])
 
 MM_ARG_ENABLE_WARNINGS([EXAMPLES_WXXFLAGS],
                        [-Wall],
-                       [-pedantic -Wall -Wextra],
+                       [-pedantic -Wall -Wextra -Wno-long-long],
                        [G PANGO ATK GDK GDK_PIXBUF GTK GDKMM ATKMM PANGOMM GTKMM])
 
 GNOME_DOC_INIT([0.9.0],,