Log Message:
libproxy: update to 0.5.0.

What's Changed

    Fix building without duktape by @mattst88 in #180
    Fix WITH_GNOME2 documentation by @mattst88 in #181
    bindings: perl: Use ccflags from %Config for libproxy module compilation by \ 
@Vogtinator in #183
    Use XDG_CURRENT_DESKTOP to detect GNOME desktop like systems by @janbrummer \ 
in #192
    Enable the use of ducktape in Windows systems by @illera88 in #194
    Enable static builds for libproxy by @illera88 in #195
    Fix build on macOS by @wegank in #189
    Complete rewrite by @janbrummer in #201
    kde: Remove line breaks in values by @janbrummer in #203
    Add man page for proxy tool by @janbrummer in #204
    Add PX_FORCE_CONFIG env by @janbrummer in #205
    add alert function to pacrunners by @multiSnow in #196
    Update architecture documentation by @janbrummer in #206
    Check for valid uri_host in ignore_ip() by @janbrummer in #210
    Remove line break in debug output by @janbrummer in #211
    Improve GNOME/KDE get_config() execution by @janbrummer in #212