Enable fb dynamicconfig loading inside eden backingstore

Summary:
Reenables dynamicconfig loading with eden backingstore. Previously it
broke edenfs-windows-release, but we believe the
opensource/fbcode_builder/manifests/eden tweak has fixed it.

Reviewed By: xavierd

Differential Revision: D29561192

fbshipit-source-id: 775dd21d177f3baa09b0192e7d3f7231008c3766

build/fbcode_builder/manifests/eden

@@ -46,6 +46,7 @@ libcurl
 fbcode/eden/oss = .
 fbcode/eden = eden
 fbcode/tools/lfs = tools/lfs
+fbcode/thrift/lib/rust = thrift/lib/rust
 
 [shipit.strip]
 ^fbcode/eden/fs/eden-config\.h$