flask: Apply Jirka's patches

diff --git a/coffee-flask b/coffee-flask
index cb581f79457546f917e56723d438fb21408d1706..677b4330b1a077e561a669889c1902084de4884e 160000 (submodule)
--- a/coffee-flask
+++ b/coffee-flask
@@ -1 +1 @@
-Subproject commit cb581f79457546f917e56723d438fb21408d1706
+Subproject commit 677b4330b1a077e561a669889c1902084de4884e