Allow --disable-plugin buildroot_lock with --calculate-build-dependencies

The --calculate-build-dependencies option unconditionally enabled
the buildroot_lock plugin, overriding an explicit --disable-plugin.
Now the plugin is only auto-enabled when the user hasn't explicitly
disabled it.

Fixes: #1758
Assisted-By: Claude Code (claude-opus-4-6)

Author: praiskup

mock/py/mockbuild/config.py

@@ -718,7 +718,8 @@ def set_config_opts_per_cmdline(config_opts, options, args):
 
     config_opts["calculatedeps"] = options.calculatedeps
     if config_opts["calculatedeps"]:
-        config_opts["plugin_conf"]["buildroot_lock_enable"] = True
+        if "buildroot_lock" not in options.disabled_plugins:
+            config_opts["plugin_conf"]["buildroot_lock_enable"] = True
 
     if options.buildroot_image:  # --buildroot-image option
         if os.path.exists(options.buildroot_image):

releng/release-notes-next/buildroot-lock-no-bootstrap-image.bugfix

@@ -1,3 +1,5 @@
 The `buildroot_lock` plugin no longer crashes when the bootstrap image is
 unavailable.  The lockfile is now only populated with bootstrap metadata when
-`use_bootstrap_image` is enabled ([issue#1758][]).
+`use_bootstrap_image` is enabled.  Also, `--calculate-build-dependencies` no
+longer overrides an explicit `--disable-plugin buildroot_lock`
+([issue#1758][]).