runtime: remove linkname from memhash{32,64} functions

github.com/parquet-go/parquet-go was listed as the only user of these
functions. parquet-go/parquet-go#142 removes the
linkname dependency on these functions, so the linkname directive can now be
removed.

src/runtime/alg.go

@@ -56,7 +56,6 @@ var useAeshash bool
 //   - github.com/outcaste-io/ristretto
 //   - github.com/puzpuzpuz/xsync/v2
 //   - github.com/puzpuzpuz/xsync/v3
-//   - github.com/parquet-go/parquet-go
 //   - github.com/authzed/spicedb
 //   - github.com/pingcap/badger
 //
@@ -66,26 +65,8 @@ var useAeshash bool
 //go:linkname memhash
 func memhash(p unsafe.Pointer, h, s uintptr) uintptr
 
-// memhash32 should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/parquet-go/parquet-go
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname memhash32
 func memhash32(p unsafe.Pointer, h uintptr) uintptr
 
-// memhash64 should be an internal detail,
-// but widely used packages access it using linkname.
-// Notable members of the hall of shame include:
-//   - github.com/parquet-go/parquet-go
-//
-// Do not remove or change the type signature.
-// See go.dev/issue/67401.
-//
-//go:linkname memhash64
 func memhash64(p unsafe.Pointer, h uintptr) uintptr
 
 // strhash should be an internal detail,