always export clang on macos

Signed-off-by: Neil Shen <overvenus@gmail.com>
diff --git a/.travis.yml b/.travis.yml
index 0c203b4..6f762ce 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,13 +27,13 @@
   - export PATH="$PATH:$HOME/.cache/bin:$HOME/.cargo/bin"
   - GRPC_HEADER="$HOME/.cache/include/grpc/grpc.h"
   - if [[ $TRAVIS_OS_NAME == "osx" ]] && [[ ! -f $GRPC_HEADER ]]; then
-      export CC=clang;
       brew update && brew install autoconf libtool shtool;
     fi
   - if [[ $TRAVIS_OS_NAME == "osx" ]]; then
       brew update && brew install openssl -f;
       export OPENSSL_ROOT_DIR=$(brew --prefix openssl);
       export LIBRARY_PATH="$(brew --prefix openssl)/lib";
+      export CC=clang;
     else
       sudo apt-get update && sudo apt-get -y install libssl-dev;
     fi
diff --git a/grpc-sys/build.rs b/grpc-sys/build.rs
index 3ae206a..3a6956e 100644
--- a/grpc-sys/build.rs
+++ b/grpc-sys/build.rs
@@ -143,7 +143,6 @@
         config.define("gRPC_BENCHMARK_PROVIDER", "none");
         if cfg!(feature = "openssl") {
             config.define("gRPC_SSL_PROVIDER", "package");
-            config.define("EMBED_OPENSSL", "false");
             // Problem is: Ubuntu Trusty shipped with openssl 1.0.1f. Which doesn't
             // support alpn. And Google's gRPC checks for support of ALPN in plane
             // old Makefile, but not in CMake.