[gegl] Update introspection.m4, default value is now auto

[Daniel Sabo <daniels src gnome org>]

commit 87bfc3a400cb4f0a6bf79b396b75dd6a4313dc39
Author: Daniel Sabo <DanielSabo gmail com>
Date:   Tue Jun 4 22:07:15 2013 -0700

    Update introspection.m4, default value is now auto

 m4/introspection.m4 |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/m4/introspection.m4 b/m4/introspection.m4
index 84e2c61..d89c3d9 100644
--- a/m4/introspection.m4
+++ b/m4/introspection.m4
@@ -22,7 +22,7 @@ m4_define([_GOBJECT_INTROSPECTION_CHECK_INTERNAL],
         AC_ARG_ENABLE(introspection,
                   AS_HELP_STRING([--enable-introspection[=@<:@no/auto/yes@:>@]],
                                  [Enable introspection for this build]),, 
-                                 [enable_introspection=no])
+                                 [enable_introspection=auto])
     ])dnl
 
     AC_MSG_CHECKING([for gobject-introspection])
@@ -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@:>@])