pmb.parse.kconfig.check: fix writing to list arg

Python passes all arguments by reference. For mutable objects such as
a list used here, changing the object will change the original one. If
components_list is not set, this means the default value gets modified.

This lead to kernels getting checked with the wrong required components.
For example, when checking a kernel from community first with the
default component_list, it would get extended with all options needed
for a kernel in community. When checking another kernel from the
testing category, also with the default component_list, it would now
check for the community options in the testing kernel.

Related: https://stackoverflow.com/a/986145
Reviewed-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lists.sr.ht/~postmarketos/pmbootstrap-devel/%3C20230402124338.64886-1-ollieparanoid@postmarketos.org%3E

pmb/parse/kconfig.py

@@ -237,6 +237,10 @@ def check(args, pkgname, components_list=[], details=False, must_exist=True):
     :returns: True when the check was successful, False otherwise
               None if the aport cannot be found (only if must_exist=False)
     """
+    # Don't modify the original component_list (arguments are passed as
+    # reference, a list is not immutable)
+    components_list = components_list.copy()
+
     # Pkgname: allow omitting "linux-" prefix
     if pkgname.startswith("linux-"):
         flavor = pkgname.split("linux-")[1]