Fixup for fast mathm

Because users of libfm do always call fm_init and fm_exit, it must be
included in every build.

src/anetz/Makefile.am

@@ -28,6 +28,7 @@ anetz_LDADD = \
 	$(top_builddir)/src/libtimer/libtimer.a \
 	$(top_builddir)/src/libsamplerate/libsamplerate.a \
 	$(top_builddir)/src/libemphasis/libemphasis.a \
+	$(top_builddir)/src/libfm/libfm.a \
 	$(top_builddir)/src/libfilter/libfilter.a \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
@@ -44,7 +45,6 @@ if HAVE_SDR
 anetz_LDADD += \
 	$(top_builddir)/src/libsdr/libsdr.a \
 	$(top_builddir)/src/libfft/libfft.a \
-	$(top_builddir)/src/libfm/libfm.a \
 	$(UHD_LIBS) \
 	$(SOAPY_LIBS)
 endif