[latexila] build: fix vapi issue

[Sébastien Wilmet <swilmet src gnome org>]

commit 6f23fd556247c258a5b1b3fa48879e1d0f56a6f5
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Thu Aug 20 12:14:56 2015 +0200

    build: fix vapi issue
    
    EXTRA_DIST is already defined above.

 src/liblatexila/Makefile.am |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/src/liblatexila/Makefile.am b/src/liblatexila/Makefile.am
index b7ea768..77ae22b 100644
--- a/src/liblatexila/Makefile.am
+++ b/src/liblatexila/Makefile.am
@@ -112,8 +112,7 @@ latexila_vapi_FILES = Latexila.gir
 
 noinst_DATA += latexila.vapi
 CLEANFILES += latexila.vapi
-
-EXTRA_DIST = latexila.vapi
+EXTRA_DIST += latexila.vapi
 
 endif # ENABLE_VAPIGEN