[MacPorts] #38796: http-fetcher @1.1.0: fix underquoted macro warning

[MacPorts]

#38796: http-fetcher @1.1.0: fix underquoted macro warning
---------------------+--------------------------------
 Reporter:  egall@…  |      Owner:  macports-tickets@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.1.3
 Keywords:           |       Port:  http-fetcher
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 When MacPorts runs `aclocal` as part of `autoreconf`, it often results in
 the following warning on my current system:
 {{{
 /opt/local/share/aclocal/http-fetcher.m4:13: warning: underquoted
 definition of AC_PATH_HFETCHER
 /opt/local/share/aclocal/http-fetcher.m4:13:   run info Automake
 'Extending aclocal'
 /opt/local/share/aclocal/http-fetcher.m4:13:   or see
 http://www.gnu.org/software/automake/manual/automake.html#Extending-
 aclocal
 }}}
 `port provides /opt/local/share/aclocal/http-fetcher.m4` returns:
 {{{
 /opt/local/share/aclocal/http-fetcher.m4 is provided by: http-fetcher
 }}}
 This should be pretty easy to fix, it's just adding an extra set of
 brackets to the AC_DEFUN part. Also this port is nomaintainer so anyone
 can fix it.

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Ticket URL: <https://trac.macports.org/ticket/38796>
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