x86inc: Flag shufps as an floating-point instruction for the AVX emulation code.

Without this, code like "shufps m0, m1, m2, 0xaa" would not work in CPUs
not supporting SSE2.

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

libavutil/x86/x86inc.asm

@@ -1016,7 +1016,7 @@ AVX_INSTR punpcklwd, 0, 0, 0
 AVX_INSTR punpckldq, 0, 0, 0
 AVX_INSTR punpcklqdq, 0, 0, 0
 AVX_INSTR pxor, 0, 0, 1
-AVX_INSTR shufps, 0, 1, 0
+AVX_INSTR shufps, 1, 1, 0
 AVX_INSTR subpd, 1, 0, 0
 AVX_INSTR subps, 1, 0, 0
 AVX_INSTR subsd, 1, 0, 0