[MacPorts] #55054: configure.pkg_config_path does not work with more than one value

[MacPorts]

#55054: configure.pkg_config_path does not work with more than one value
---------------------------------+-----------------
 Reporter:  MarcusCalhoun-Lopez  |      Owner:
     Type:  defect               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  base                 |    Version:
 Keywords:                       |       Port:
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 The latest version of avahi requires .pc files located in both[[BR]]
 {{{${prefix}/Library/Frameworks/Python.framework/Versions/2.7/lib/pkgconfig}}}[[BR]]
 and[[BR]]
 {{{${prefix}/libexec/qt4/lib/pkgconfig}}}.

 The resulting environmental variable is:
 {{{
 PKG_CONFIG_PATH='/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/pkgconfig
 /opt/local/libexec/qt4/lib/pkgconfig'
 }}}
 However, the list of directories must be [https://linux.die.net/man/1/pkg-
 config colon-separated].

 For now, an ugly workaround in the Portfile is:
 {{{
 pre-configure {
     configure.env-append PKG_CONFIG_PATH=[join
 ${configure.pkg_config_path} ":"]
     configure.pkg_config_path
 }
 }}}
 Eventually, the problem should be fixed in the base.

 Attached is a proposed fix.

--
Ticket URL: <https://trac.macports.org/ticket/55054>
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