[meld.wiki] Update Building binaries

[Kai Willadsen <kaiw src gnome org>]

commit fdb19b33ae10bfb5ae5ec13d9d2773cc7575c5eb
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sat Aug 3 21:05:33 2019 +0000

    Update Building binaries

 Building-binaries.md | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
---
diff --git a/Building-binaries.md b/Building-binaries.md
index 695bbc1..4f47060 100644
--- a/Building-binaries.md
+++ b/Building-binaries.md
@@ -1,4 +1,11 @@
-## Building Meld on Windows
+## Building current Meld on Windows
+
+Meld has migrated to using an msys2 environment on Gitlab CI for building Windows binaries.
+
+With a working msys2 environment and a local git clone of the Meld repository, reproducing the steps in the 
`mingw32-dist` and `mingw-common` sections of https://gitlab.gnome.org/GNOME/meld/blob/master/.gitlab-ci.yml 
should give you an installable MSI.
+
+
+## Building pre-3.20 Meld on Windows
 
 As of version 3.11.1, Meld supports building on Windows.