Implement `bootstrap-gstreamer` for all platforms

This change makes it so that the Platform classes can now handle
installing GStreamer dependencies and properly setting up the
environment including when cross-compiling. For Windows and Linux
is now installed into `target/dependencies/gstreamer` when not installed
system-wide. In addition:

1. Creating and moving existing environment path append helpers to
   `util.py`.
2. Combining the `set_run_env` and `build_dev` functions and moving
   some outside code into them so that it can be shared. Now code that
   used to call `set_run_env` calls `build_dev` and then
   `os.environ.update(...)`.
3. Adding Python typing information in many places.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

1 files changed, 3 insertions, 6 deletions

diff --git a/python/servo/devenv_commands.py b/python/servo/devenv_commands.py
index f69a1c8231f..77b95ba743f 100644
--- a/python/servo/devenv_commands.py
+++ b/python/servo/devenv_commands.py
@@ -48,9 +48,8 @@ class MachCommands(CommandBase):
 
         self.ensure_bootstrapped(target=target)
         self.ensure_clobbered()
-        env = self.build_env()
 
-        status = self.run_cargo_build_like_command("check", params, env=env, features=features, **kwargs)
+        status = self.run_cargo_build_like_command("check", params, features=features, **kwargs)
         if status == 0:
             print('Finished checking, binary NOT updated. Consider ./mach build before ./mach run')
 
@@ -142,9 +141,8 @@ class MachCommands(CommandBase):
 
         self.ensure_bootstrapped(target=target)
         self.ensure_clobbered()
-        env = self.build_env()
 
-        return self.run_cargo_build_like_command("fix", params, env=env, features=features, **kwargs)
+        return self.run_cargo_build_like_command("fix", params, features=features, **kwargs)
 
     @Command('cargo-clippy',
              description='Run "cargo clippy"',
@@ -166,9 +164,8 @@ class MachCommands(CommandBase):
 
         self.ensure_bootstrapped(target=target)
         self.ensure_clobbered()
-        env = self.build_env()
 
-        return self.run_cargo_build_like_command("clippy", params, env=env, features=features, **kwargs)
+        return self.run_cargo_build_like_command("clippy", params, features=features, **kwargs)
 
     @Command('grep',
              description='`git grep` for selected directories.',