Fix build failure with MSVC

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14983)

crypto/ec/curve448/arch_32/f_impl32.c

@@ -10,6 +10,7 @@
  * Originally written by Mike Hamburg
  */
 
+#include "e_os.h"
 #include "openssl/macros.h"
 #include "internal/numbers.h"
 

crypto/ec/curve448/arch_64/f_impl64.c

@@ -10,6 +10,7 @@
  * Originally written by Mike Hamburg
  */
 
+#include "e_os.h"
 #include "openssl/macros.h"
 #include "internal/numbers.h"