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Clipping the encoder input to +/-2 to prevent scaling errors

If someone messed up scaling, they'll know because it'll sound bad

--- a/libcelt/arch.h

+++ b/libcelt/arch.h

@@ -225,7 +225,7 @@

 #define DIV32(a,b)     (((celt_word32)(a))/(celt_word32)(b))

 #define PDIV32(a,b)     (((celt_word32)(a))/(celt_word32)(b))

-#define SCALEIN(a)	((a)*CELT_SIG_SCALE)

+#define SCALEIN(a)	(MAX16(-2, MIN16(2,a))*CELT_SIG_SCALE)

 #define SCALEOUT(a)	((a)*(1/CELT_SIG_SCALE))

 #endif /* !FIXED_POINT */