Add clang dependency to docker images, update validation checks (#1794)

ci/buildkite.yml

@@ -4,7 +4,7 @@ steps:
     env:
       CARGO_TARGET_CACHE_NAME: "stable"
     timeout_in_minutes: 30
-  - command: "ci/docker-run.sh solanalabs/rust-nightly:2018-10-04 ci/test-bench.sh"
+  - command: "ci/docker-run.sh solanalabs/rust-nightly:2018-11-12 ci/test-bench.sh"
     name: "bench [public]"
     env:
       CARGO_TARGET_CACHE_NAME: "nightly"
@@ -12,7 +12,7 @@ steps:
   - command: "ci/shellcheck.sh"
     name: "shellcheck [public]"
     timeout_in_minutes: 20
-  - command: "ci/docker-run.sh solanalabs/rust-nightly:2018-10-04 ci/test-nightly.sh"
+  - command: "ci/docker-run.sh solanalabs/rust-nightly:2018-11-12 ci/test-nightly.sh"
     name: "nightly [public]"
     env:
       CARGO_TARGET_CACHE_NAME: "nightly"

ci/docker-rust/Dockerfile

@@ -12,6 +12,7 @@ RUN set -x && \
     apt update && \
     apt install -y \
       buildkite-agent \
+      clang-7 \
       cmake \
       lcov \
       libclang-common-7-dev \

ci/version-check.sh

@@ -20,8 +20,8 @@ require() {
 
 case ${1:-stable} in
 nightly)
-  require rustc 1.31.[0-9]+-nightly
-  require cargo 1.31.[0-9]+-nightly
+  require rustc 1.32.[0-9]+-nightly
+  require cargo 1.32.[0-9]+-nightly
   ;;
 stable)
   require rustc 1.30.[0-9]+