cppcheck: (error) Shifting signed 64-bit value by 63 bits

As of cppcheck 1.82 surpress the warning regarding shifting too many
bits for __divdi3() implemention.  The algorithm used here is correct.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #9732

module/os/linux/spl/spl-generic.c

@@ -275,7 +275,9 @@ int64_t
 __divdi3(int64_t u, int64_t v)
 {
 	int64_t q, t;
+	// cppcheck-suppress shiftTooManyBitsSigned
 	q = __udivdi3(abs64(u), abs64(v));
+	// cppcheck-suppress shiftTooManyBitsSigned
 	t = (u ^ v) >> 63;	// If u, v have different
 	return ((q ^ t) - t);	// signs, negate q.
 }