Remove support for BeOS
diff --git a/Modules/expat/expat_external.h b/Modules/expat/expat_external.h
index f054014..3f1c363 100644
--- a/Modules/expat/expat_external.h
+++ b/Modules/expat/expat_external.h
@@ -11,7 +11,7 @@
    co-exist. */
 #include "pyexpatns.h"
 
-#if defined(_MSC_EXTENSIONS) && !defined(__BEOS__) && !defined(__CYGWIN__)
+#if defined(_MSC_EXTENSIONS) && !defined(__CYGWIN__)
 #define XML_USE_MSC_EXTENSIONS 1
 #endif