Don't pass host cross linux musl modules to Make

Make doesn't understand host cross linux musl modules, don't pass
them to make.  Continue passing them to make when USE_HOST_MUSL=true
is set.

Bug: 236052820
Test: builds with linux musl arm64 host cross configured
Change-Id: Id8b90ca0fa698fdf658156b458cc385387768414

android/androidmk.go

@@ -945,7 +945,10 @@ func shouldSkipAndroidMkProcessing(module *ModuleBase) bool {
 	return !module.Enabled() ||
 		module.commonProperties.HideFromMake ||
 		// Make does not understand LinuxBionic
-		module.Os() == LinuxBionic
+		module.Os() == LinuxBionic ||
+		// Make does not understand LinuxMusl, except when we are building with USE_HOST_MUSL=true
+		// and all host binaries are LinuxMusl
+		(module.Os() == LinuxMusl && module.Target().HostCross)
 }
 
 // A utility func to format LOCAL_TEST_DATA outputs. See the comments on DataPath to understand how