Fix SunOS 4 building issue.

PR: 1196

e_os.h

@@ -566,7 +566,7 @@ extern char *sys_errlist[]; extern int sys_nerr;
 # define strerror(errnum) \
 	(((errnum)<0 || (errnum)>=sys_nerr) ? NULL : sys_errlist[errnum])
   /* Being signed SunOS 4.x memcpy breaks ASN1_OBJECT table lookup */
-#include "o_str.h"
+#include "crypto/o_str.h"
 # define memcmp OPENSSL_memcmp
 #endif