crash_reporter: Remove udev collector from Android build

Currently one of the udev collector tests is failing due to the lack
of gzip on the device.  Since we don't have gzip nor udev in Android builds,
remove the udev collector (and tests) from Android builds.

See http://r.android.com/184708 for discussion on removing the udev
collector completely from the source.

Bug: 25779348
Test: `/data/nativetest/crash_reporter_tests/crash_reporter_tests` passes

Change-Id: I883359ac8219f2e1fa6a78927433dbc0be295fe7