re-add definition of OPENSSL_MSTR deleted from opensslv.h in macros.h
#ifndef OPENSSL_MACROS_H
# define OPENSSL_MACROS_H
+/* Helper macros for CPP string composition */
+# define OPENSSL_MSTR_HELPER(x) #x
+# define OPENSSL_MSTR(x) OPENSSL_MSTR_HELPER(x)
+
/*
* Sometimes OPENSSSL_NO_xxx ends up with an empty file and some compilers
* don't like that. This will hopefully silence them.
