libpgf and tinyxml2

[Niclas Rosenvik <nros%users.sourceforge.net@localhost>]

I have packaged libpgf and tinyxml2 in wip and would like to have them
reviewed and imported to the main pkgsrc tree if that is possible since
I consider them finished. 
I have tested libpgfs buildlink3.mk with graphics/digikam and 
when including it cmake finds libpgf and links to the 
installed library instead of the bundled one.
I have build libpgf and tinyxml2 without problems on NetBSD 6, 
NetBSD-current, FreeBSD 9.2 and Fedora Linux.

/Niclas Rosenvik