attempting build fix for non-x86 ubuntu:rolling

This might not work, but I can't test it locally (who actually has
ppc64le and s390x hardware, anyway?)

Signed-off-by: Steven Noonan <[email protected]>

Author: Steven Noonan

src/steamnetworkingsockets/steamnetworkingsockets_certstore.cpp

@@ -8,6 +8,7 @@
 
 #include <time.h>
 #include <ostream>
+#include <crypto.h>
 #include <crypto_25519.h>
 #include "steamnetworkingsockets_certstore.h"
 #include <tier1/utlhashmap.h>