Incorporate CM108 support for Mac

The generic config file can now be simplified slightly, since the
section on using CM108 for PTT is now common to all of Linux, Windows
and Mac.

Author: mfncooper

Diff for: conf/generic.conf

@@ -277,20 +277,14 @@
 %C%# Radio-Interface-Guide.pdf  in  https://github.com/wb2osz/direwolf-doc
 %C%# goes into detail about the various options.
 %C%
-%L%# If using a C-Media CM108/CM119 or similar USB Audio Adapter,
-%L%# you can use a GPIO pin for PTT control. This is very convenient
-%L%# because a single USB connection is used for both audio and PTT.
-%L%# Example:
-%L%
-%L%#PTT CM108
-%L%
-%W%# If using a C-Media CM108/CM119 or similar USB Audio Adapter,
-%W%# you can use a GPIO pin for PTT control. This is very convenient
-%W%# because a single USB connection is used for both audio and PTT.
-%W%# Example:
-%W%
-%W%#PTT CM108
-%W%%C%#
+%C%# If using a C-Media CM108/CM119 or similar USB Audio Adapter,
+%C%# you can use a GPIO pin for PTT control. This is very convenient
+%C%# because a single USB connection is used for both audio and PTT.
+%C%# Example:
+%C%
+%C%#PTT CM108
+%C%
+%C%#
 %C%# The transmitter Push to Talk (PTT) control can be wired to a serial port
 %C%# with a suitable interface circuit.  DON'T connect it directly!
 %C%#