Commits on Apr 26, 2018

1. [beta] Remove dependency on parking_lot …

   Unfortunately the `parking_lot` crate enables the `synchapi` feature of the
   `winapi` crate which activates a dependency on `libsynchronization.a`. The MinGW
   version of `libsynchronization.a` pulls in a dependency
   `api-ms-core-synch-l1-2-0.dll` which causes rustc to not work on Windows 7
   (tracked in rust-lang#49438)
   
   The `parking_lot` crate is not currently used in the compiler unless parallel
   queries are enabled. This feature is not enabled by default and not used at all
   in the beta/stable compilers. As a result the dependency in this commit was
   removed and the CI build which checks parallel queries was disabled.
   
   This isn't a great long-term solution but should hopefully be enough of a patch
   for beta to buy us some more time to figure this out.

   

   alexcrichton committed Apr 26, 2018
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