[json-glib] build: Resync our copy of introspection.m4

[Emmanuele Bassi <ebassi src gnome org>]

commit 7b9d72519777b313d094a0e63a9f138e3fafd54c
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Mar 18 19:22:15 2014 +0000

    build: Resync our copy of introspection.m4

 build/autotools/introspection.m4 |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/build/autotools/introspection.m4 b/build/autotools/introspection.m4
index 589721c..d89c3d9 100644
--- a/build/autotools/introspection.m4
+++ b/build/autotools/introspection.m4
@@ -41,6 +41,8 @@ m4_define([_GOBJECT_INTROSPECTION_CHECK_INTERNAL],
     ],dnl
     [auto],[dnl
         PKG_CHECK_EXISTS([gobject-introspection-1.0 >= $1], found_introspection=yes, found_introspection=no)
+       dnl Canonicalize enable_introspection
+       enable_introspection=$found_introspection
     ],dnl
     [dnl       
         AC_MSG_ERROR([invalid argument passed to --enable-introspection, should be one of 
@<:@no/auto/yes@:>@])