Add mac hermetic support to build/config/mac/sdk_info.py.

build/config/mac/sdk_info.py

Index: build/config/mac/sdk_info.py
diff --git a/build/config/mac/sdk_info.py b/build/config/mac/sdk_info.py
index d4b12a9c1e1e1baaa0c728b8be4519d12a5efaaf..52b252449aa1c884921541f4b49d488e4dc0cae9 100644
--- a/build/config/mac/sdk_info.py
+++ b/build/config/mac/sdk_info.py
@@ -6,6 +6,9 @@ import os
 import subprocess
 import sys
 
+sys.path.append(os.path.dirname(os.path.dirname(os.path.dirname(__file__))))
+import mac_toolchain
+
 # This script prints information about the build system, the operating
 # system and the iOS or Mac SDK (depending on the platform "iphonesimulator",
 # "iphoneos" or "macosx" generally).
@@ -57,6 +60,9 @@ if __name__ == '__main__':
         os.path.basename(sys.argv[0]))
     sys.exit(1)
 
+  # Try using the toolchain in mac_files.
+  mac_toolchain.SetToolchainEnvironment()
+
   settings = {}
   FillMachineOSBuild(settings)
   FillXcodeVersion(settings)