android: remove obsolete sourcing of Env.Host.sh advice

README.Android

@@ -15,7 +15,7 @@ Then it is necessary to get stdout/err to go to somewhere we can find it:
 
 	Then:
 
-	. Env.Host.sh
+	make cmd cmd=bash
 	cd android/qa/sc
 	make clean all install
 	make run ; adb shell logcat

README.cross

@@ -387,7 +387,7 @@ The activity used for these apps is in android/Bootstrap. See
 README.Android.
 
 To build the complex unit test (for Calc functionality; invokes the
-"ucalc" unit test code from sc) source the environment (. Env.Host.sh)
+"ucalc" unit test code from sc) setup your environment (make cmd cmd=bash)
 and cd to android/qa/sc and run a "make". The Makefile here is
 completely manually written, this stuff is so experimental it doesn't
 make sense yet to try to integrate with the normal gbuild