Stop trying to build on Darwin, Windows

Reviewed By: nilesr

Differential Revision: D26059442

fbshipit-source-id: d323ab38d7171b344c5a15863ec8d0a70b877853

Author: snarkmaster

build/fbcode_builder/manifests/bistro

@@ -7,9 +7,13 @@ shipit_fbcode_builder = true
 [git]
 repo_url = https://github.com/facebook/bistro.git
 
-[build]
+[build.os=linux]
 builder = bistro
 
+# Bistro is Linux-specific
+[build.not(os=linux)]
+builder = nop
+
 [dependencies]
 fmt
 folly