Revisit how the Android port works.
Fix#20855Fix#18625Fix#21147
Before polishing and making sure everything works fine (like the VR code, the android-x86 version, the non-android version of the lib, …), I'd like to get some early feedback on the approach.
I recommend reviewing commit by commit.
To test, just follow the regular steps:
```
./mach build -d --android
./mach package --dev --android builds servo.apk
./mach install --dev --android && ./mach run --android
```
---
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"./mach env" cause unclear message.
We did't use "LD_LIBRARY_PATH" and no need display this.
<!-- Please describe your changes on the following line: -->
Remove the print message.
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Update mozjs_sys to include cross-compilation fixes.
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#20958
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improve test-tidy
check wpt manifest when run tidy
If CI has already run `test-tidy`, and then no need to run `etc/ci/manifest_changed.sh`
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