15:14 rakuco 

x11-toolkits/attica: Change the location where we install its headers.

In preparation for the upcoming KDE Frameworks 5 and Plasma 5 ports, install
attica's headers into include/attica/attica instead of include/attica.

Users of attica reference the headers in the code with
    #include <attica/foo.h>
which means the compiler is passed -I${LOCALBASE}/include for the headers to
be found.

The KDE Frameworks 5 version of attica installs the headers into
include/KF5/attica, so depending on the other of the arguments the compiler
can end up being passed
    -I${LOCALBASE}/include -I${LOCALBASE}/include/KF5
leading to the wrong attica headers being used instead.

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