closes bpo-38174: Update vendored expat library to 2.2.8. (GH-16346)

Fixes CVE-2019-15903. See full changelog at https://github.com/libexpat/libexpat/blob/R_2_2_8/expat/Changes.
diff --git a/Modules/expat/winconfig.h b/Modules/expat/winconfig.h
index 28a043c..562a4a8 100644
--- a/Modules/expat/winconfig.h
+++ b/Modules/expat/winconfig.h
@@ -40,20 +40,17 @@
 #include <memory.h>
 #include <string.h>
 
+#if defined(HAVE_EXPAT_CONFIG_H) /* e.g. MinGW */
+#  include <expat_config.h>
+#else /* !defined(HAVE_EXPAT_CONFIG_H) */
 
-#if defined(HAVE_EXPAT_CONFIG_H)  /* e.g. MinGW */
-# include <expat_config.h>
-#else  /* !defined(HAVE_EXPAT_CONFIG_H) */
-
-
-#define XML_NS 1
-#define XML_DTD 1
-#define XML_CONTEXT_BYTES 1024
+#  define XML_NS 1
+#  define XML_DTD 1
+#  define XML_CONTEXT_BYTES 1024
 
 /* we will assume all Windows platforms are little endian */
-#define BYTEORDER 1234
+#  define BYTEORDER 1234
 
 #endif /* !defined(HAVE_EXPAT_CONFIG_H) */
 
-
 #endif /* ndef WINCONFIG_H */