Extend ALLOW_MISSING_DEPENDENCIES coverage

Make build system respect ALLOW_MISSING_DEPENDENCIES, when building
architecture B products, and ignore targets with dependencies that
are not available for architecture B.

Bug: 142701187
Test: # Add a dummy Android.bp with a module only for arm64
      $ m -j TARGET_PRODUCT=aosp_x86 TARGET_BUILD_VARIANT=userdebug

Change-Id: I64de33674732df8c286671c806a07bcd19862b80

cc/cc.go

@@ -1925,7 +1925,11 @@ func (c *Module) depsToPaths(ctx android.ModuleContext) PathDeps {
 
 		if ptr != nil {
 			if !linkFile.Valid() {
+				if !ctx.Config().AllowMissingDependencies() {
 					ctx.ModuleErrorf("module %q missing output file", depName)
+				} else {
+					ctx.AddMissingDependencies([]string{depName})
+				}
 				return
 			}
 			*ptr = append(*ptr, linkFile.Path())