keep msys pacman up to date

chearon · chearon · commit dce86dbc114a · 2018-11-07T21:35:24.000-05:00
diff --git a/ci/win/preinstall.sh b/ci/win/preinstall.sh
@@ -4,6 +4,8 @@ deps="cairo-2 png16-16 jpeg-8 pango-1.0-0 pangocairo-1.0-0 gobject-2.0-0 glib-2.
 
 # install cairo and tools to create .lib
 
+pacman -Sy
+
 pacman --noconfirm -S \
   wget \
   unzip \
