Replace epa_build of Qt5.2.1 with epa_build of Qt5.3.1
Replace epa_build of Qt5.2.1 with epa_build of Qt5.3.1

By skipping some additional modules that are not necessary for PLplot
support, got the build time down to less than 20 minutes.

Tested by Alan W. Irwin <airwin@users.sourceforge.net> on Linux by
building PLplot against this qt5_lite (5.3.1) version (using the
-DPLPLOT_USE_QT5=ON cmake option) and by checking reasonable run-time
results were obtained for all qt devices (qtwidget, bmpqt, jpgqt,
pdfqt, pngqt, ppmqt, svgqt, and tiffqt) when running the test_all_qt
target (which also runs the test_qt_example target).  These qt device
driver results that depend on Qt5 still have vertical character
alignment issues, but the uniform large (more than half a character
height) offset that was worked out to compensate for that Qt5 bug for
Qt5.2.1 still seems to work for this Qt5.3.1 case.

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