winspool: Implement GetPrinterDriverA with GetPrinterDriverW, notably using the larger sizes, which fixes a bug in printing with Acrobat Reader 9.2.

winspool: When retrieving PRINTER_INFO_7, the lack of a directory service print queue object is represented with a NULL pointer and a successful return, not an error return.

winspool: Implement GetPrinterA via GetPrinterW, largely to support the eccentricity that GetPrinterA allocates buffers as large as those required by GetPrinterW.

snd_pcm_prepare is called below, and snd_pcm_sw_params is called before
sw_params is initialized.