Fix the build

aa79cf8 appeared to cleanly rebase,
becoming 0b0aa9d. But this was a lie!
The guts of stimes became more monomorphic in 0.12, so this commit
removed a 'fromIntegral' that is necessary only in the 0.11 branch.

Not catching this before pushing was definitely my bad. Sorry!

Data/ByteString/Internal/Type.hs

@@ -857,7 +857,7 @@ times n (BS fp len)
  | len == 1 = unsafeCreateFp size $ \destfptr -> do
  byte <- peekFp fp
  unsafeWithForeignPtr destfptr $ \destptr ->
- fillBytes destptr byte n
+ fillBytes destptr byte (fromIntegral n)
  | otherwise = unsafeCreateFp size $ \destptr -> do
  memcpyFp destptr fp len
  fillFrom destptr len