LV2: add FFTW_CFLAGS to build recent files including smfft.hh

Signed-off-by: Stefan Westerfeld <[email protected]>

Author: swesterfeld

lv2/Makefile.am

@@ -1,6 +1,6 @@
 include $(top_srcdir)/Makefile.decl
 
-AM_CXXFLAGS += $(LV2_CFLAGS) $(GLIB_CFLAGS) $(SNDFILE_CFLAGS) $(JACK_CFLAGS) $(CAIRO_CFLAGS) -I$(top_srcdir)/lib -I$(top_srcdir)/glui $(CFLAG_VISIBILITY)
+AM_CXXFLAGS += $(LV2_CFLAGS) $(GLIB_CFLAGS) $(FFTW_CFLAGS) $(SNDFILE_CFLAGS) $(JACK_CFLAGS) $(CAIRO_CFLAGS) -I$(top_srcdir)/lib -I$(top_srcdir)/glui $(CFLAG_VISIBILITY)
 
 spectmorph_lv2dir = $(libdir)/lv2/spectmorph.lv2