Consider DEVELOPER_DIR when building wrapped_clang

Author: brentleyjones

tools/cpp/cc_configure.bzl

@@ -165,6 +165,7 @@ cc_autoconf = repository_rule(
         "CC_CONFIGURE_DEBUG",
         "CC_TOOLCHAIN_NAME",
         "CPLUS_INCLUDE_PATH",
+        "DEVELOPER_DIR",
         "GCOV",
         "HOMEBREW_RUBY_PATH",
         "SYSTEMROOT",

tools/cpp/osx_cc_configure.bzl

@@ -114,6 +114,7 @@ def configure_osx_toolchain(repository_ctx, overriden_tools):
         xcrun_result = repository_ctx.execute([
             "env",
             "-i",
+            "DEVELOPER_DIR={}".format(env.get("DEVELOPER_DIR", default = "")),
             "xcrun",
             "--sdk",
             "macosx",