Reenable the powerpc64le-unknown-linux-gnu target

With the LLVM upgrade in nightly, this should compile again.

.travis.yml

@@ -24,7 +24,6 @@ matrix:
     # - env: TARGET=thumbv7em-none-eabihf
 
     # Failing due to x32 compile errors
-    # time: Blocked on waiting for 0.1.40 release: https://crates.io/crates/time
     # parking_lot: Blocked on merge: https://github.com/Amanieu/parking_lot/pull/73
     # - env: TARGET=x86_64-unknown-linux-gnux32
 
@@ -98,9 +97,8 @@ matrix:
     - env: TARGET=powerpc64-unknown-linux-gnu
     - env: TARGET=s390x-unknown-linux-gnu DISABLE_TESTS=1
 
-    # Failing due to LLVM 6
-    # https://github.com/LiveSplit/livesplit-core/issues/124
-    # - env: TARGET=powerpc64le-unknown-linux-gnu
+    - env: TARGET=powerpc64le-unknown-linux-gnu
+      rust: nightly # requires Rust >=1.28
 
     # Testing other channels
     - env: TARGET=x86_64-unknown-linux-gnu