[tomboy] Fixed building Evolution add-in on Ubuntu 12.04

[Jared L Jennings <jjennings src gnome org>]

commit 36c0f0c7d78972fe28f804c6021d6dc78871f1f8
Author: Alex Tereschenko <frozen and blue gmail com>
Date:   Wed Jul 18 19:31:26 2012 +0200

    Fixed building Evolution add-in on Ubuntu 12.04
    
    ...and most probably other Debian-based systems with gmime-sharp 2.6
    
    Signed-off-by: Jared Jennings <jjennings src gnome org>

 configure.in |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/configure.in b/configure.in
index 1cde9ec..bd9e1ff 100644
--- a/configure.in
+++ b/configure.in
@@ -237,6 +237,8 @@ done
 if test "x$ENABLE_GNOME" != "xno"; then
 	if pkg-config --exists gmime-sharp-2.4; then
 		PKG_CHECK_MODULES(EVOLUTION, gmime-sharp-2.4, ENABLE_EVOLUTION="yes", ENABLE_EVOLUTION="no")
+	elif pkg-config --exists gmime-sharp-2.6; then
+		PKG_CHECK_MODULES(EVOLUTION, gmime-sharp-2.6, ENABLE_EVOLUTION="yes", ENABLE_EVOLUTION="no")
 	else
 		PKG_CHECK_MODULES(EVOLUTION, gmime-sharp >= 2.2.7, ENABLE_EVOLUTION="yes", ENABLE_EVOLUTION="no")
 	fi