servo: Merge #14551 - Remove legacy items from .gitignore (from upsuper:legacy-gitignore); r=emilio

The gitignore items being removed were added in f403129 for temporary files generated by `make` for cocoa integration. However, cocoa integration was later moved into its own repo [servo/cocoa-rs](https://github.com/servo/cocoa-rs), and thus the items are no longer necessary.

Source-Repo: https://github.com/servo/servo
Source-Revision: 7eb7d7adb2ab10642193f013f59fa93dd042d41a

servo/.gitignore

@@ -9,20 +9,12 @@
 /python/_virtualenv
 /python/tidy/servo_tidy.egg-info
 *~
-*#
-*.o
-*.so
-*.dylib
-*.dSYM
-*.dll
-*.dummy
 *.pkl
 *.pyc
 *.swp
 *.swo
 *.csv
 .DS_Store
-servo-test
 Servo.app
 .config.mk.last
 /glfw