[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.
videoplayer: adapt lateness detection and dropping to buffering
video player: present correct pts to user for a/v sync (after buffering in renderer)
videoplayer: some rework and documentation
renderer: bump buffers to 5
videoplayer: update frametime, it might change due to fps detection
videoplayer: give streams with invalid fps a chance for fps detection
dvdplayer: allow rewinding at end of stream, do a seek after rewind
dvdplayer: observe pts counter overflow
dvdplayer: avoid short screen flicker caused by unnecessary reconfigure of renderer
vdpau: advanced settings for auto deinterlacing
player: fix rewind
OMXPlayer: some caching fixes for pvr
fix incorrect display of fps when dr kicks in
ActiveAE: slightly reduce buffer size
Revert "vdpau: comment some features that will be added later"

This reverts commit e00b4f65864d623ab4d2e9e5c06db138e661f1cf.
ffmpeg demuxer: faster channel change for PVR addons without internal demuxing
(such as MediaPortal, ArgusTV, MythTV, NextPVR)
Credits: FernetMenta, Davilla, Popcornmix, Whaupt