Add vendor

Specifically because I want to modify a dependency

vendor/github.com/charmbracelet/x/term/term_unix_other.go

@@ -0,0 +1,11 @@
+//go:build aix || linux || solaris || zos
+// +build aix linux solaris zos
+
+package term
+
+import "golang.org/x/sys/unix"
+
+const (
+	ioctlReadTermios  = unix.TCGETS
+	ioctlWriteTermios = unix.TCSETS
+)