[MacPorts] #35247: curl: install libcurl.m4

[MacPorts]

#35247: curl: install libcurl.m4
------------------------------+---------------------------------------------
 Reporter:  cal@…             |       Owner:  ryandesign@…           
     Type:  defect            |      Status:  new                    
 Priority:  Normal            |   Milestone:                         
Component:  ports             |     Version:  2.1.1                  
 Keywords:  haspatch          |        Port:  curl                   
------------------------------+---------------------------------------------
 Curl doesn't install `libcurl.m4`, but some autotools-based software tries
 to use macros defined in `libcurl.m4` and expects the distribution to ship
 this file.

 The attached patch installs the file from
 `${worksrcpath}/docs/libcurl/libcurl.m4` into `${prefix}/share/aclocal`
 like a number of other ports already do with their `$name.m4` files.

 This blocks the update of yubico-c-client and yubico-pam (which have
 removed their downstream copy of this file).

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Ticket URL: <https://trac.macports.org/ticket/35247>
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