remove version_universe from rust rules

Summary: `version_universe` was used by buck1, and in buck2 it's a noop. Don't set in in macros and remove it from buck2/prelude.

Reviewed By: dtolnay

Differential Revision: D67398567

fbshipit-source-id: 669b350a8c770e8d08d52ffa20dfde57351f4c45

decls/rust_rules.bzl

@@ -32,7 +32,6 @@ def _rust_common_attributes(is_binary: bool):
         "resources": attrs.named_set(attrs.one_of(attrs.dep(), attrs.source()), sorted = True, default = []),
         "rustdoc_flags": attrs.list(attrs.arg(), default = []),
         "separate_debug_info": attrs.bool(default = False),
-        "version_universe": attrs.option(attrs.string(), default = None),
         "_exec_os_type": buck.exec_os_type_arg(),
         "_target_os_type": buck.target_os_type_arg(),
     }