Support newer cpuid

[jgoerzen]

Hi,

While packaging this for Debian, we have cpuid v2 in the repository and I needed to get it to compile with that version.

The patch for compatibility with cpuid v2 is simple:

--- a/cpu.go
+++ b/cpu.go
@@ -5,6 +5,6 @@
 import "github.com/klauspost/cpuid"
 
 var (
-	haveAVX2   = cpuid.CPU.AVX2()
-	haveAVX512 = cpuid.CPU.AVX512F()
+	haveAVX2   = cpuid.CPU.Supports(cpuid.AVX2)
+	haveAVX512 = cpuid.CPU.Supports(cpuid.AVX512F)
 )

Thanks!

[lukechampine]

fixed in 09d3897