xbps-src: create a void-packages symlink for xbps>=0.41.
hooks/script-wrapper: fix generated cups-config wrapper.

This was changing cups_serverbin to the cross toolchain sysroot
and caused cups-filters to install bins to this path.
cups-filters: update to 1.0.59.
environment/pkg-config: unset PKG_CONFIG; find it via PATH instead.

... otherwise some pkgs fail to build due to host vs target (gtk+3).
xbps-src: export XBPS_WRAPPERDIR for cross builds (could be used for native too).
gtk+3: remove pkg-config wrapper; use it from host instead.
xbps-git: bump (new xbps-checkvers tests by @Gottox).
mpv: update to 0.5.4.
xbps-src: create the void-packages symlink unconditionally.
pango: update to 1.36.8.
runit-void: bump (typo fix).
Manual.md: typofix.