Implement GItlab CI daily builds for windows platform (32 & 64) (#5923)

* Implement win32 & win64 builds in Gitlab CI + pkg improvements

* windows buildbot: split build & deploy steps
* move deb artifacts to root folder to have a nicer artifact
* add windows build + packaging on xenial

util/buildbot/buildwin32.sh

@@ -149,6 +149,8 @@ cmake .. \
 	-DLEVELDB_LIBRARY=$libdir/leveldb/lib/libleveldb.dll.a \
 	-DLEVELDB_DLL=$libdir/leveldb/bin/libleveldb.dll
 
-make package -j2
+make -j2
+
+[ "x$NO_PACKAGE" = "x" ] && make package
 
 # EOF