Merge 53501 and 53502 from 25 branch:
Add /GS- for AMD64 and Itanium builds where missing.
diff --git a/PCbuild/build_ssl.py b/PCbuild/build_ssl.py
index 5ab3449..2a31ca4 100644
--- a/PCbuild/build_ssl.py
+++ b/PCbuild/build_ssl.py
@@ -169,6 +169,8 @@
     defs = "SSL_DIR=\"%s\"" % (ssl_dir,)
     if debug:
         defs = defs + " " + "DEBUG=1"
+    if arch in ('amd64', 'ia64'):
+        defs = defs + " EXTRA_CFLAGS=/GS-"
     makeCommand = 'nmake /nologo -f _ssl.mak ' + defs + " " + make_flags
     print "Executing:", makeCommand
     sys.stdout.flush()