Add function pointer typedef.
Switch to use /* */ comments to survive pickier compile flags.
Add dsp_uart_destroy function (takes ** pointer so it can set the pointer back to NULL)
git-svn-id: http://svn.openzap.org/svn/openzap/trunk@200 a93c3328-9c30-0410-af19-c9cd2b2d52af
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