bug#4546: a patch: use xdg-open for opening URLs by default

[Daniel Novotny]

hello,

this patch comes from one of our users:
it uses xdg-open(1) command for "M-x browse-url",
so the URL is opened in the browser, which is
set as the default browser by the user in his/her
desktop settings

see attachment.

best regards, have a nice day,

 Daniel Novotny, Red Hat inc.

emacs-23.1-xdg.patch
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