Merge pull request #1147 from krbullock/fix/openssl-darwin-pkgconfig

Build Ruby against the right OpenSSL on macOS if pkg-config is present

bin/ruby-build

@@ -1011,6 +1011,9 @@ build_package_mac_openssl() {
   # Tell Ruby to use this openssl for its extension.
   package_option ruby configure --with-openssl-dir="$OPENSSL_PREFIX_PATH"
 
+  # Make sure pkg-config finds our build first.
+  export PKG_CONFIG_PATH="${OPENSSL_PREFIX_PATH}/lib/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}"
+
   # Hint OpenSSL that we prefer a 64-bit build.
   export KERNEL_BITS="64"
   OPENSSL_CONFIGURE="${OPENSSL_CONFIGURE:-./config}"