Disable the SHA-3 Hash function: QCryptographicHash doesn't need it

QCryptographicHash will do the full Init/Update/Final calls, so we
don't need the Hash function. Disable it from the compilation to avoid
a warning about a function defined but not used.

Change-Id: Ib48ae4a7be91089fdcffa00851b786816b798cd9
Reviewed-by: Richard J. Moore <rich@kde.org>

src/3rdparty/sha3/KeccakNISTInterface.c

@@ -62,6 +62,7 @@ static HashReturn Final(hashState *state, BitSequence *hashval)
     return (HashReturn) Squeeze(state, hashval, state->fixedOutputLength);
 }
 
+#ifndef QT_BUILDING_QT
 static HashReturn Hash(int hashbitlen, const BitSequence *data, DataLength databitlen, BitSequence *hashval)
 {
     hashState state;
@@ -78,4 +79,4 @@ static HashReturn Hash(int hashbitlen, const BitSequence *data, DataLength datab
     result = Final(&state, hashval);
     return result;
 }
-
+#endif