Use the libspeexdsp resampler

AFAICT it runs a little slower? but it's fixed point, and has much
better understood audio characteristics.

lib/speexdsp/libspeexdsp/bfin.h

@@ -0,0 +1,15 @@
+/* Common Blackfin assembly defines
+ *
+ * Copyright (C) 2005-2009 Analog Devices
+ */
+
+#if __GNUC__ <= 3
+/* GCC-3.4 and older did not use hardware loops and thus did not have
+ * register constraints for declaring clobbers.
+ */
+# define BFIN_HWLOOP0_REGS
+# define BFIN_HWLOOP1_REGS
+#else
+# define BFIN_HWLOOP0_REGS , "LB0", "LT0", "LC0"
+# define BFIN_HWLOOP1_REGS , "LB1", "LT1", "LC1"
+#endif