csctapi/io_serial.c : fix the serial port read/write wait routine to use select instead of poll
This make them compatible with Mac OS X and now oscamd works on OS X. The same code off course
still works on linux and other unix platforms. I let that code ran for 24h before commiting this code.
If you have any issue let me know and I'llr evert to poll for non compatible machines.
all the others : fix all the warning due to sign difference (mostly uchar versus char). This make the code compile
with -Werror on the more strict version of gcc (which is the case on OS X). I also noticed that in a lot of places
the code use a buffer defined as an uchar * ... and use strings functions (strnXXXX) where some memcpy/memcmp .. function
would have been preferable as we're suposedly manipulation a binary buffer. Anyway I fixed all of them and it now compile
without any warning or error on linux and OS X (and also probably on all the other unices but we will have to try before
adding -Werror on the other platform).