web/server: disable address reuse option for BaseHTTPServer on windows
On windows, a socket with the SO_REUSEADDR option set is able to bind to
any port, even if there's already an active socket listening on it.
test-http: check server address cannot be reused.
% init
% commit
adding base
% qnew mqbase
% qrefresh
% qdiff
diff -r 67e992f2c4f3 base
--- a/base
+++ b/base
@@ -1,1 +1,1 @@ base
-base
+patched
% qdiff dirname
diff -r 67e992f2c4f3 base
--- a/base
+++ b/base
@@ -1,1 +1,1 @@ base
-base
+patched