Handle ifdef for local variables.

Fixes: 205337522
Test: internal
Change-Id: Ib29654e76e8dc7c0982bfe0b471a1aca33935117

mk2rbc/mk2rbc_test.go

@@ -226,6 +226,9 @@ ifdef  PRODUCT_NAME
   PRODUCT_NAME = gizmo
 else
 endif
+local_var :=
+ifdef local_var
+endif
 `,
 		expected: `load("//build/make/core:product_config.rbc", "rblf")
 
@@ -235,6 +238,9 @@ def init(g, handle):
     cfg["PRODUCT_NAME"] = "gizmo"
   else:
     pass
+  _local_var = ""
+  if _local_var:
+    pass
 `,
 	},
 	{

mk2rbc/variable.go

@@ -177,8 +177,8 @@ type localVariable struct {
 	baseVariable
 }
 
-func (lv localVariable) emitDefined(_ *generationContext) {
-	panic("implement me")
+func (lv localVariable) emitDefined(gctx *generationContext) {
+	gctx.writef(lv.String())
 }
 
 func (lv localVariable) String() string {