[evolution-rss] Auto-disable WebKit support when compiled against evolution 3.21.90+

[Milan Crha <mcrha src gnome org>]

commit a5b4473b6cc55e016560ce4dcf26c715737da2d5
Author: Milan Crha <mcrha redhat com>
Date:   Wed Aug 17 19:12:27 2016 +0200

    Auto-disable WebKit support when compiled against evolution 3.21.90+
    
    It's optional and the code uses the mail formatter, not its own web engine,
    which seems to be sufficient. Furthermore, evolution-rss uses WebKit1, but
    WebKit2 is used in the evolution since 3.21.90 and these two cannot be
    used together, thus rather disable WebKit code here.

 configure.ac |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 629e663..27640b6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -259,6 +259,9 @@ AC_MSG_CHECKING([whether to include Webkit support])
 AC_ARG_ENABLE([webkit],
        AS_HELP_STRING([--disable-webkit],[Disable Webkit (Apple Upstream Webkit) support (default: 
enabled)]),
        [],[enable_webkit=yes])
+if test "$evolution_version_int" -ge "32190"; then
+       enable_webkit="no, due to evolution 3.21.90+"
+fi
 AC_MSG_RESULT([$enable_webkit])
 
 if test "$enable_webkit" = "yes"; then