Compromise on the blocking open() call with certain OSS drivers. The

workaround is now turned off by default.  If the --enable-broken-oss
option is passed to configure or if ALSA is detected, the workaround is
turned on during compilation.  This will resolve bug 48.


git-svn-id: http://svn.xiph.org/trunk/ao@2146 0101bb08-14d6-0310-b084-bc0e0c8e3800