fix __m64 imports

Author: gnzlbg

coresimd/src/x86/i686/sse2.rs

@@ -2,8 +2,7 @@
 
 use core::mem;
 use v128::*;
-use v64::i32x2;
-use x86::__m64;
+use v64::{__m64, i32x2};
 
 #[cfg(test)]
 use stdsimd_test::assert_instr;

coresimd/src/x86/i686/ssse3.rs

@@ -5,7 +5,6 @@ use stdsimd_test::assert_instr;
 
 use core::mem;
 use v64::*;
-use x86::__m64;
 
 /// Compute the absolute value of packed 8-bit integers in `a` and
 /// return the unsigned results.