chan_beagle: Initial port to compile on current Asterisk.

There are still a few unresolved references to SND_PCCV
stuff on my machine, but otherwise, this updates the
code for current Asterisk APIs. The sample config
has been moved out of the module itself into its own
sample file.

Resolves: #280

Makefiles.diff

@@ -15,12 +15,13 @@ diff --git a/channels/Makefile b/channels/Makefile
 index 0af82d9ff0..9337710728 100644
 --- a/channels/Makefile
 +++ b/channels/Makefile
-@@ -30,6 +30,9 @@ $(call MOD_ADD_C,chan_sip,$(wildcard sip/*.c))
+@@ -30,6 +30,10 @@ $(call MOD_ADD_C,chan_sip,$(wildcard sip/*.c))
  $(call MOD_ADD_C,chan_pjsip,$(wildcard pjsip/*.c))
  $(call MOD_ADD_C,chan_dahdi,$(wildcard dahdi/*.c) sig_analog.c sig_pri.c sig_ss7.c)
 
 +chan_simpleusb.so: LIBS+=-lusb -lasound
 +chan_usbradio.so: LIBS+=-lusb -lasound
++chan_beagle.so: LIBS+=-lasound
 +
  chan_dahdi.o: _ASTCFLAGS+=$(call get_menuselect_cflags,LOTS_OF_SPANS)
  chan_mgcp.o: _ASTCFLAGS+=$(AST_NO_FORMAT_TRUNCATION)