DO NOT MERGE make travis run the musl build

drop this when approved

Author: martell

.travis.yml

@@ -42,7 +42,7 @@ matrix:
     - { <<: *linux, env: SKIP_TESTS=1 TARGET=mips64-unknown-linux-gnuabi64   }
     - { <<: *linux, env: SKIP_TESTS=1 TARGET=mips64el-unknown-linux-gnuabi64 }
     - { <<: *linux, env: SKIP_TESTS=1 TARGET=s390x-unknown-linux-gnu         }
-    - { <<: *linux, env: SKIP_TESTS=1 TARGET=x86_64-unknown-linux-musl       }
+    - { os: linux, env: SKIP_TESTS=1 TARGET=x86_64-unknown-linux-musl        }
     - { <<: *linux, env: SKIP_TESTS=1 TARGET=arm-linux-androideabi           }
     - { <<: *linux, env: SKIP_TESTS=1 TARGET=armv7-linux-androideabi         }
     - { <<: *linux, env: SKIP_TESTS=1 TARGET=aarch64-linux-android           }

ci/build-run-docker.sh

@@ -47,7 +47,6 @@ docker run \
   --env LIBZ_SYS_STATIC=1 \
   --volume "${HOME}"/.cache/sccache:/sccache \
   --env SCCACHE_DIR=/sccache \
-  --env RUSTC_WRAPPER=sccache \
   --tty \
   --init \
   --rm \