Ensure that SIZE_MAX is defined where OSSL_SSIZE_MAX is used.

include/openssl/e_os2.h defines OSSL_SSIZE_MAX in terms of SIZE_MAX as a
fallback.  This doesn't work well on platforms where SIZE_MAX isn't defined,
so we must ensure that it's defined by including "internal/numbers.h".
Since this is compensating for operating system discrepancies, it's
reasonable to make this change in include/internal/e_os.h.

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from #19693)

(cherry picked from commit 1a298b0)

include/internal/e_os.h

@@ -16,6 +16,7 @@
 # include <openssl/e_os2.h>
 # include <openssl/crypto.h>
 # include "internal/nelem.h"
+# include "internal/numbers.h"   /* Ensure the definition of SIZE_MAX */
 
 /*
  * <openssl/e_os2.h> contains what we can justify to make visible to the