add Servant to build flags again

While the build flag is removed, datalad tests are relying on it being
present and there is no harm.

diff --git a/BuildFlags.hs b/BuildFlags.hs
index 53ea8e6fe3d162a5fddaa2f40aee98c5af886cc2..d4a3a4f73efc4311ab63171e0a2507c5d4dc8fa1 100644 (file)
--- a/BuildFlags.hs
+++ b/BuildFlags.hs
@@ -64,6 +64,7 @@ buildFlags = filter (not . null)
        , "Testsuite"
        , "S3"
        , "WebDAV"
+       , "Servant"
 #ifdef WITH_OSPATH
        , "OsPath"
 #else