Delete android/env.go .

Properly plumb the available environment to the configuration instead of
going through the global variable originalEnv.

Test: Presubmit.
Change-Id: Ia1ea753d5e72c02a0dcaa4c0b43bd6e24fc47cec

android/Android.bp

@@ -78,9 +78,6 @@ bootstrap_go_package {
         "variable.go",
         "visibility.go",
         "writedocs.go",
-
-        // Lock down environment access last
-        "env.go",
     ],
     testSrcs: [
         "android_test.go",