Handle links prefixed with spaces in atom

[oprudkyi]

handles malformed atom with links like

		<link href=" http://example.org"></link>

i.e. space between " and http
real world sample https://www.php.net/feed.atom

  <entry xmlns="http://www.w3.org/2005/Atom" xmlns:default="http://php.net/ns/news" xml:base="entries/2020-02-17-1.xml">
  <title>LoopRun Barcelona 2020</title>
  <id>https://www.php.net/archive/2020.php#2020-02-17-1</id>
  <published>2020-02-17T11:52:20+01:00</published>
  <updated>2020-02-17T11:52:20+01:00</updated>
  <link href="https://www.php.net/conferences/index.php#id2020-02-17-1" rel="alternate" type="text/html"/>
  <link href=" https://loop-run.io" rel="via" type="text/html"/>