build: Remove unset and empty INCLUDES variable
build: Remove unset and empty INCLUDES variable

https://bugzilla.gnome.org/show_bug.cgi?id=784221

Signed-off-by: W. Michael Petullo <a17fed27eaa842282862ff7c1b9c8395a26ac320@flyn.org>

GNOME/libdmapsharing,GNOME/libdmapsharing,GNOME/libdmapsharing