[grilo-plugins] build: Support gmime 3.0

[Bastien Nocera <hadess src gnome org>]

commit f460a00bea4dcb91c6da9dd79caba463bc57b56a
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Mar 7 15:09:30 2017 +0100

    build: Support gmime 3.0
    
    And remove support for gmime 2.4 from 2012.

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a1cfe65..dc304b6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -164,9 +164,9 @@ fi
 
 PKG_CHECK_MODULES([JSON], [json-glib-1.0], HAVE_JSON_GLIB=yes, HAVE_JSON_GLIB=no)
 
-PKG_CHECK_MODULES(GMIME, gmime-2.6,
+PKG_CHECK_MODULES(GMIME, gmime-3.0,
                          HAVE_GMIME=yes,
-                         [PKG_CHECK_MODULES(GMIME, gmime-2.4,
+                         [PKG_CHECK_MODULES(GMIME, gmime-2.6,
                                                    HAVE_GMIME=yes,
                                                    HAVE_GMIME=no)])