Log Message:
print/gutenprint-lib: Update to 5.2.15

* Changes from 5.2.14

  1) The following printers have been added:

     Epson Expression ET-2600 EcoTank ET
     Canon SELPHY CP1300

  2) The following printers have seen bugfixes:

     Sony UP-CR10L
     Sony UP-DR150
     Sony UP-DR200

  3) Miscellaneous fixes for DNP DS80DX, DNP DS820, Mitsubishi P95D,
     Shinko S1245, Sony UP-CR10L, UP-DR150, and UP-DR200, and Kodak
     68xx series.

  4) The Macintosh uninstaller, which was inadvertently removed from
     5.2.14, has been restored.