fbcode_builder: fix the shipit path map for fbzmq

Summary:
Fix the fbzmq pathmap listed in its manifest file to match the path map
actually used by ShipIt.  The fact that this was broken was why internal
getdeps builds did not detect that D16577367 broke the build.

Reviewed By: wez, jstrizich

Differential Revision: D17005360

fbshipit-source-id: 046ff58ad70c03b860c3fccebaba975808df244d

build/fbcode_builder/manifests/fbzmq

@@ -19,7 +19,7 @@ sigar
 libzmq
 
 [shipit.pathmap]
-fbcode/fbzmq = .
+fbcode/fbzmq = fbzmq
 fbcode/fbzmq/public_tld = .
 
 [shipit.strip]