Bug 996566 - Execute OS.File xpcshell tests on Android. r=jmaher

testing/xpcshell/xpcshell_android.ini

@@ -29,6 +29,7 @@
 [include:gfx/tests/unit/xpcshell.ini]
 [include:services/common/tests/unit/xpcshell.ini]
 [include:toolkit/components/telemetry/tests/unit/xpcshell.ini]
+[include:toolkit/components/osfile/tests/xpcshell/xpcshell.ini]
 [include:netwerk/test/unit/xpcshell.ini]
 [include:intl/strres/tests/unit/xpcshell.ini]
 [include:intl/unicharutil/tests/unit/xpcshell.ini]