[PATCHES] libxfce4util: Fix up GIR slightly and add vapi generation

[Vidar Braut Haarr]

Hi,

Attached are 5 patches that should get libxfce4util up to speed so
that it's usable with GIR, and also adds vapigen generation for vala
bindings.

0001 is for gcc 7.x, it silences a new warning.
0002 adds vapigen
0003 makes sure our gir/vapi is namespaced "Xfce" and not "xfce"
0004 Changes libxfce4util-1.0.pc.in so that our PKG_CONFIG path is
actually (for example) /usr/include/xfce4/libxfce4util and not
/usr/include/xfce4
0005 adds a metadata to gir/vapi generation that fixes their
assumption for the header file name
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