crypto: sha3-generic - Use __optimize to support old compilers

With gcc-4.1.2:

    crypto/sha3_generic.c:39: warning: ‘__optimize__’ attribute directive ignored

Use the newly introduced __optimize macro to fix this.

Fixes: 83dee2c ("crypto: sha3-generic - rewrite KECCAK transform to help the compiler optimize")
Signed-off-by: Geert Uytterhoeven <[email protected]>
Acked-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

crypto/sha3_generic.c

@@ -152,7 +152,7 @@ static SHA3_INLINE void keccakf_round(u64 st[25])
 	st[24] ^= bc[ 4];
 }
 
-static void __attribute__((__optimize__("O3"))) keccakf(u64 st[25])
+static void __optimize("O3") keccakf(u64 st[25])
 {
 	int round;