Bug 1869892 - Remove *_{cpu,os,vendor} from target.json. r=releng-rev…

…iewers,bhearsum

This is a (probably) safe thing to do before going all the way to
removing the file. This will unlock fixing bug 1869078.

Differential Revision: https://phabricator.services.mozilla.com/D196355

toolkit/mozapps/installer/informulate.py

@@ -31,13 +31,7 @@ def main():
 
     important_substitutions = [
         "target_alias",
-        "target_cpu",
-        "target_os",
-        "target_vendor",
         "host_alias",
-        "host_cpu",
-        "host_os",
-        "host_vendor",
         "MOZ_UPDATE_CHANNEL",
         "MOZ_APP_VENDOR",
         "MOZ_APP_NAME",