ac97 has drivers for Vista 64-bit whereas sb16 and es1370 do not appear to.  I
asked malc why it was disabled and he said it was because it was GPL.  He did
not object to enabling it now that more QEMU code is GPL'd.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6253 c046a42c-6fe2-441c-8c8c-71466251a162