Add legacy inlines for locale aware APIs.

Test: make checkbuild tests
Bug: http://b/31639993
Change-Id: Ic43d690dff3c6960d7826bd0b064640a3ea0e883
diff --git a/libc/include/wchar.h b/libc/include/wchar.h
index e7c294f..1c0327e 100644
--- a/libc/include/wchar.h
+++ b/libc/include/wchar.h
@@ -149,4 +149,6 @@
 
 __END_DECLS
 
+#include <android/legacy_wchar_inlines.h>
+
 #endif /* _WCHAR_H_ */