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

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

Author: swesterfeld

tests/Makefile.am

@@ -1,6 +1,6 @@
 include $(top_srcdir)/Makefile.decl
 
-AM_CXXFLAGS += $(GLIB_CFLAGS) $(SNDFILE_CFLAGS) -I$(top_srcdir)/lib -I$(top_srcdir)/src
+AM_CXXFLAGS += $(GLIB_CFLAGS) $(FFTW_CFLAGS) $(SNDFILE_CFLAGS) -I$(top_srcdir)/lib -I$(top_srcdir)/src
 
 ASCII2WAV = $(top_builddir)/tools/ascii2wav
 SINSIGNAL = $(srcdir)/sinsignal.py