Replace $(call my-dir) with a string literal

This is so that we can set LOCAL_PATH to the result
of my-dir, as LOCAL_PATH can only be set to a string
literal of the exact value of LOCAL_PATH.

It's probably also the correct choice to start phasing
out LOCAL_PATH.

Bug: 214405650
Test: go test
Change-Id: Ia97d7fedf4ce62643921d90a176e65edd4e2fce6
diff --git a/mk2rbc/mk2rbc.go b/mk2rbc/mk2rbc.go
index 35d7d4d..0441854 100644
--- a/mk2rbc/mk2rbc.go
+++ b/mk2rbc/mk2rbc.go
@@ -1370,7 +1370,7 @@
 	if !args.Empty() {
 		return ctx.newBadExpr(node, "my-dir function cannot have any arguments passed to it.")
 	}
-	return &variableRefExpr{ctx.addVariable("LOCAL_PATH"), true}
+	return &stringLiteralExpr{literal: filepath.Dir(ctx.script.mkFile)}
 }
 
 type isProductInListCallParser struct{}