cmd: shim and init into separate binaries

This change also fixes a deadlock when shim fails to connect and complete the setup.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

cmd/finit/ipc/payload.go

@@ -0,0 +1,15 @@
+package init0
+
+const Env = "FORTIFY_INIT"
+
+type Payload struct {
+	// target full exec path
+	Argv0 string
+	// child full argv
+	Argv []string
+	// wayland fd, -1 to disable
+	WL int
+
+	// verbosity pass through
+	Verbose bool
+}