[gmime/ricotz/vapi] Improve vala bindings

[Rico Tzschichholz <ricotz src gnome org>]

commit 40c6138d751c188f3f50e6a52b9335e218c41985
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Nov 27 22:25:27 2018 +0100

    Improve vala bindings
    
    Fixes https://gitlab.gnome.org/GNOME/gmime/issues/2

 gmime/GMime-3.0.metadata | 3 +++
 gmime/Makefile.am        | 4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/gmime/GMime-3.0.metadata b/gmime/GMime-3.0.metadata
index d4886df2..c81d6898 100644
--- a/gmime/GMime-3.0.metadata
+++ b/gmime/GMime-3.0.metadata
@@ -19,3 +19,6 @@ Filter
   .outreal type="uint8[]"
        .outbuf type="unowned uint8[]" array_length_field="outsize"
   .outptr type="unowned uint8[]"
+
+FilterBest
+  .charset#method name="get_charset"
diff --git a/gmime/Makefile.am b/gmime/Makefile.am
index b90dc4bc..71d7e6d2 100644
--- a/gmime/Makefile.am
+++ b/gmime/Makefile.am
@@ -209,8 +209,8 @@ GMime_3_0_gir_EXPORT_PACKAGES = gmime-3.0
 GMime_3_0_gir_SCANNERFLAGS = \
        --c-include="gmime/gmime.h" \
        --accept-unprefixed \
-       --symbol-prefix "gmime_" \
-       --symbol-prefix "g_mime_"
+       --symbol-prefix "g_mime" \
+       --symbol-prefix "gmime"
 INTROSPECTION_GIRS += GMime-3.0.gir
 
 girdir = $(datadir)/gir-1.0