The opengl module doesn't build on Solaris since 4.7.2 with CC 5.9

CC -c -xldscope=hidden -mt -KPIC -DQT_SHARED -DQT_EDITION=QT_EDITION_DESKTOP -DQT_BUILD_OPENGL_LIB -DQT_NO_USING_NAMESPACE -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT3_SUPPORT -DQT_MOC_COMPAT -DQT_USE_FAST_OPERATOR_PLUS -DQT_USE_FAST_CONCATENATION -DQT_NO_FREETYPE -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I../../mkspecs/solaris-cc -I. -I../../include/QtCore -I../../include/QtGui -I../../include -I../../include/QtOpenGL -I.rcc/release-shared -I../3rdparty/harfbuzz/src -I/usr/openwin/share/include -I/usr/openwin/share/include -I.moc/release-shared -I/usr/sfw/include -o .obj/release-shared/qtriangulator.o gl2paintengineex/qtriangulator.cpp
"gl2paintengineex/qtriangulator.cpp", line 1760: Error: QTriangulator<T>::ComplexToSimple::searchEdgeLeftOf(int) const, returning QRBTree<int>::Node*, was previously declared returning int*.
"gl2paintengineex/qtriangulator.cpp", line 1776: Error: QTriangulator<T>::ComplexToSimple::searchEdgeLeftOf(int, QRBTree<int>::Node*) const, returning QRBTree<int>::Node*, was previously declared returning int*.
2 Error(s) detected.