[devhelp] build: GTK-Doc >= 1.25 is required

[Sébastien Wilmet <swilmet src gnome org>]

commit 0f5395d88d28f3bbc231f3f91ffc7c09b6fdb8e3
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Wed Mar 1 14:06:14 2017 +0100

    build: GTK-Doc >= 1.25 is required
    
    Because &package_name;, &package_string; and maybe others are used (XML
    entities for PACKAGE variables).

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index df013ea..d75a42c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -91,7 +91,7 @@ AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE,"$GETTEXT_PACKAGE", [Package name for gettext
 AM_PATH_PYTHON([2.3],[],[no])
 
 AX_REQUIRE_DEFINED([GTK_DOC_CHECK])
-GTK_DOC_CHECK([1.14],[--flavour no-tmpl])
+GTK_DOC_CHECK([1.25],[--flavour no-tmpl])
 
 AC_CONFIG_FILES([
 Makefile