Fix typo: macsox -> macosx

Progress towards fixing macOS toolchain builds.

Author: dan-zheng

utils/swift_build_support/swift_build_support/products/tensorflow.py

@@ -188,7 +188,7 @@ def install(self, host_target):
             _get_tensorflow_library(host_target)
 
         subdir = None
-        if host_target.startswith('macsox'):
+        if host_target.startswith('macosx'):
             subdir = 'macosx'
         if host_target.startswith('linux'):
             subdir = 'linux'