Don't require <stropts.h>
Don't require <stropts.h>

Some Linux systems don't have <stropts.h>, so this changes the curl
config files to not use it.

Change-Id: I2533ee43b9a58f9b80e1c7380c0d1f4ea493f362

shaka-project/shaka-player-embedded,shaka-project/shaka-player-embedded,shaka-project/shaka-player-embedded,shaka-project/shaka-player-embedded,shaka-project/shaka-player-embedded