New Port: libdc1394

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A Portfile for libdc1394. See: ​http://damien.douxchamps.net/ieee1394/libdc1394/

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Added in r50610, thanks; made a few changes:

• used the obfuscated form of your email address
• when using a mirror group (like sourceforge) in master_sites, it defaults to the port name for subdirectory name, so removed ":libdc1394" there
• when there's only one distfile to download, you can omit the file name in checksums, so removed that
• this installs a pkgconfig file in ${prefix}/lib/pkgconfig so added a dependency on the pkgconfig port with depends_build