fix target downloading Psi nightly builds

git-svn-id: svn+ssh://svn.psi-im.org/home/psi/svn/win-installer/trunk@43 2d3a5ac0-73f9-4639-b284-2310bd1da355

Makefile

@@ -21,6 +21,7 @@ download_lang:
 
 download_psi_nightly:
 	rm -rf app/*.zip
+	mkdir -p app
 	wget -nv http://www.kismith.co.uk/files/psi/windows/nightlies/ -O _tmplist
 	@f=$$(cat _tmplist | grep .zip | tail -n1 | sed 's|.*HREF="\(.*\)">.*|\1|g'); wget $(SRC_APP)/$$f -O app/$$f
 	rm -f _tmplist