[gnome-builder] build: fix namespace for vapi generation

[Christian Hergert <chergert src gnome org>]

commit df0042c4dbad99f7293d1c44093a09d42e126724
Author: Christian Hergert <christian hergert me>
Date:   Tue Sep 29 22:15:21 2015 -0700

    build: fix namespace for vapi generation

 src/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 7109766..94bc134 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -314,7 +314,7 @@ Builder_1_0_gir_SCANNERFLAGS = \
        --c-include="gnome-builder.h" \
        -n Builder \
        --identifier-prefix=Gb \
-       --symbol-prefix=gb_ \
+       --symbol-prefix=gb \
        --nsversion 1.0 \
        $(NULL)
 INTROSPECTION_GIRS += Builder-1.0.gir