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quantize.h: revert back to some more generic SSE2 code

This hopefully closes #29.

--- a/libfaac/quantize.c

+++ b/libfaac/quantize.c

@@ -246,11 +246,11 @@

               {

                   __m128 x = {xr[cnt], xr[cnt + 1], xr[cnt + 2], xr[cnt + 3]};

-                  x = _mm_max_ps(x, -x);

-                  x *= (__m128){sfacfix, sfacfix, sfacfix, sfacfix};

-                  x *= _mm_sqrt_ps(x);

+                  x = _mm_max_ps(x, _mm_sub_ps((__m128){0, 0, 0, 0}, x));

+                  x = _mm_mul_ps(x, (__m128){sfacfix, sfacfix, sfacfix, sfacfix});

+                  x = _mm_mul_ps(x, _mm_sqrt_ps(x));

                   x = _mm_sqrt_ps(x);

-                  x += (__m128){MAGIC_NUMBER, MAGIC_NUMBER, MAGIC_NUMBER, MAGIC_NUMBER};

+                  x = _mm_add_ps(x, (__m128){MAGIC_NUMBER, MAGIC_NUMBER, MAGIC_NUMBER, MAGIC_NUMBER});

                   *(__m128i*)(xi + cnt) = _mm_cvttps_epi32(x);

               }