Remove unneeded traits on sys types

[nick-mobilecoin]

Previously Send and Sync were declared on the sys versions of
Mutex, RwLock, and Condvar. Per
https://doc.rust-lang.org/nomicon/send-and-sync.html these traites are
automatically derived when composed entirely of Send/Sync types. The
types from mc-sgx-tstdc do derive Send and Sync so the redeclaring
of the traits here is unneeded.

[nick-mobilecoin]

Current dependencies on/for this PR:

• main
  • PR Update CI for SGX SDK action update #14
    • PR Move panic to panic/abort #13
      • PR Add untrusted side of stderr from enclave #15
        • PR Add mc-sgx-io #22
          • PR Add mc-sgx-panic-log #24
            • PR Add mc-sgx-panic crate for common panic handling #30
              • PR Add panicking::panic_count to mc-sgx-panic #31
                • PR Update CODEOWNERS file #32
                  • PR Add panicking::panicking() function #33
                  • PR Add public function thread::panicking() #34
                  • PR Add mc-sgx-sync crate #35
                  • PR Add poison.rs to mc-sgx-sync crate #36
                  • PR Add sys module to mc-sgx-sync #39
                  • PR Add mutex.rs to mc-sgx-sync crate #40
                  • PR Use a static buffer for panic messages #41
                  • PR Add mc-sgx-sync::sys::locks::Condvar #42
                  • PR Add Condvar to mc-sgx-sync crate #43
                  • PR Add mc-sgx-sync::sys::locks::RwLock #44
                  • PR Add RwLock to mc-sgx-sync #45
                  • PR Add example usage for mc-sgx-sync and std::sync #46
                  • PR Merge panic-abort and panic-log crates into mc-sgx-panic #48
                  • PR Prevent recursive panics from happening #50
                  • PR Remove unneeded traits on sys types #51 👈
        • PR Rename mc-sgx-io to mc-sgx-io-untrusted #21

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[codecov-commenter]

Codecov Report

Merging #51 (d141270) into nick/prevent-recursive-panic (d97b920) will not change coverage.
The diff coverage is n/a.

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@@                      Coverage Diff                      @@
##           nick/prevent-recursive-panic      #51   +/-   ##
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  Coverage                         92.87%   92.87%           
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  Files                                 9        9           
  Lines                               323      323           
=============================================================
  Hits                                300      300           
  Misses                               23       23           

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[samdealy]

LGTM, thanks for the explanation in the PR description.