Restructure: Move fsk from common code to 'libfsk'

src/nmt/Makefile.am

@@ -31,6 +31,7 @@ nmt_LDADD = \
 	$(top_builddir)/src/libtimer/libtimer.a \
 	$(top_builddir)/src/libsamplerate/libsamplerate.a \
 	$(top_builddir)/src/libemphasis/libemphasis.a \
+	$(top_builddir)/src/libfsk/libfsk.a \
 	$(top_builddir)/src/libfm/libfm.a \
 	$(top_builddir)/src/libfilter/libfilter.a \
 	$(top_builddir)/src/libwave/libwave.a \

src/nmt/nmt.h

@@ -3,7 +3,7 @@
 #include "../common/compandor.h"
 #include "../libdtmf/dtmf_encode.h"
 #include "../common/call.h"
-#include "../common/fsk.h"
+#include "../libfsk/fsk.h"
 #include "../libgoertzel/goertzel.h"
 #include "dms.h"
 #include "sms.h"