[latexila] build: use --disable-since-check vala flag more permanently

[Sébastien Wilmet <swilmet src gnome org>]

commit d17bb3088488d145ec3ff510eee70587cee1abfb
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Jun 12 05:03:53 2017 +0200

    build: use --disable-since-check vala flag more permanently
    
    See commit b0eac7d561e4bd697976cbd72d0ae3d709ef1d54 for why this vala
    flag has been added. It's possible that in the future the check is fixed
    upstream to work fine with unstable GNOME libraries versioning, in which
    case the flag can be removed.

 src/Makefile.am |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index b3d1fb2..1641df2 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,11 +2,11 @@ SUBDIRS = evince gedit liblatexila ui
 
 bin_PROGRAMS = latexila
 
-# TODO remember to remove --disable-since-check when GtkSourceView 3.24 is
-# released...
+# --disable-since-check is used because LaTeXila often depends on unstable
+# versions of GNOME libraries.
 AM_VALAFLAGS =                 \
-       --pkg gtk+-3.0          \
        --disable-since-check   \
+       --pkg gtk+-3.0          \
        --pkg gtksourceview-3.0 \
        --pkg tepl-3            \
        --pkg gspell-1          \