[locale] uClibc is built with 'generic' support for stdc++ locale()

Quote from libstdc++-v3/config.log:
configure:15959: checking for C locale to use
configure:15963: result: generic
[addons][Fix] Make the auto update of addons work again.
This fixes a regression introduced by 2b35f385c5d62d19b6857b1baf56f0d509f51545.
Merge pull request #5289 from bkuhls/uClibc

[locale] uClibc is built with 'generic' support for stdc++ locale()
Merge pull request #5302 from ace20022/fix_autoupdate

[addons][Fix] Make the auto update of addons work again.