Add OutputFile to cc.Module

APEX needs to know the location of the output file of cc.Module to copy
it to an intermediate directory and package there.

Bug: 112672359
Test: m apex.test
Change-Id: Iaa19b29c2859df96f50716001dbd57df3f596050

cc/cc.go

@@ -366,6 +366,10 @@ type Module struct {
 	staticVariant *Module
 }
 
+func (c *Module) OutputFile() android.OptionalPath {
+	return c.outputFile
+}
+
 func (c *Module) Init() android.Module {
 	c.AddProperties(&c.Properties, &c.VendorProperties)
 	if c.compiler != nil {