Rename loongarchx to loong64. (#130)

loong64 GOARCH value reserved for LoongArch architecture:
	https://golang.org/doc/go1.17.

github issues:
	https://github.com/golang/go/issues/46229

LoongArch documents:
	https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html

Signed-off-by: guoqi.chen <chenguoqi@loongson.cn>
diff --git a/ztypes_loong64.go b/ztypes_loong64.go
new file mode 100644
index 0000000..3beb5c1
--- /dev/null
+++ b/ztypes_loong64.go
@@ -0,0 +1,12 @@
+//go:build loong64
+// +build loong64
+
+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs types.go
+
+package pty
+
+type (
+	_C_int  int32
+	_C_uint uint32
+)
diff --git a/ztypes_loongarchx.go b/ztypes_loongarchx.go
deleted file mode 100644
index 674d2a4..0000000
--- a/ztypes_loongarchx.go
+++ /dev/null
@@ -1,13 +0,0 @@
-//go:build (loongarch32 || loongarch64) && linux
-//+build linux
-//+build loongarch32 loongarch64
-
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types.go
-
-package pty
-
-type (
-	_C_int  int32
-	_C_uint uint32
-)