Bug 1663786 - Remove "copy" support from virtualenv handling r=ahal

This is unused.

Differential Revision: https://phabricator.services.mozilla.com/D89509

python/mozbuild/mozbuild/virtualenv.py

@@ -298,9 +298,6 @@ def populate(self, sitecustomize=None):
             processed like normal. e.g.
             "optional:setup.py:python/foo:built_ext:-i"
 
-        copy -- Copies the given file in the virtualenv site packages
-            directory.
-
         packages.txt -- Denotes that the specified path is a child manifest. It
             will be read and processed as if its contents were concatenated
             into the manifest being read.
@@ -354,16 +351,6 @@ def handle_package(package):
 
                 return True
 
-            if package[0] == 'copy':
-                assert len(package) == 2
-
-                src = os.path.join(self.topsrcdir, package[1])
-                dst = os.path.join(python_lib, os.path.basename(package[1]))
-
-                shutil.copy(src, dst)
-
-                return True
-
             if package[0] == 'packages.txt':
                 assert len(package) == 2