[gspell] build: show whether the doc is built in the Configuration summary

[Sébastien Wilmet <swilmet src gnome org>]

commit 21796fe54907fd677ea1f0827fe2211e5fa111fa
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Mar 28 16:04:58 2016 +0200

    build: show whether the doc is built in the Configuration summary

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b87cb39..6521514 100644
--- a/configure.ac
+++ b/configure.ac
@@ -221,6 +221,7 @@ Configuration:
 
        Source code location:   ${srcdir}
        Compiler:               ${CC}
+       Documentation:          ${enable_gtk_doc}
        GObject introspection:  ${found_introspection}
        Vala:                   ${enable_vala}
        Code coverage:          ${enable_code_coverage}