make sure new bfin.h is included in dist

Looks like I didn't test the `make dist` target and so broke it by not
listing the bfin.h in one of the headers vars.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

libspeex/Makefile.am

@@ -35,7 +35,7 @@ endif
 
 libspeexdsp_la_SOURCES = preprocess.c jitter.c mdf.c fftwrap.c filterbank.c resample.c buffer.c scal.c $(FFTSRC)
 
-noinst_HEADERS = 	arch.h 	cb_search_arm4.h 	cb_search_bfin.h 	cb_search_sse.h \
+noinst_HEADERS = 	arch.h 	bfin.h cb_search_arm4.h 	cb_search_bfin.h 	cb_search_sse.h \
 		filters.h 	filters_arm4.h 	filters_bfin.h 	filters_sse.h 	fixed_arm4.h \
 		fixed_arm5e.h 	fixed_bfin.h 	fixed_debug.h 	lpc.h 	lpc_bfin.h 	ltp.h 	ltp_arm4.h \
 		ltp_sse.h 	math_approx.h 		misc_bfin.h 	nb_celp.h 	quant_lsp.h 	sb_celp.h \