python-PyQt4: fix configure-ng.py --qmake syntax

srcpkgs/python-PyQt4/template

@@ -30,7 +30,7 @@ do_build() {
 	for pyver in $py2_ver $py3_ver; do
 		cd $wrksrc/pyqt4-$pyver
 		python${pyver} configure-ng.py --confirm-license --assume-shared \
-			--qmake /usr/lib/qt/bin/qmake \
+			--qmake=/usr/lib/qt/bin/qmake \
 			CC="${CC}" CFLAGS="${CFLAGS}" CXX="${CXX}" CXXFLAGS="${CXXFLAGS}" \
 			LINK="${CXX}" LINK_SHLIB="${CXX}" LFLAGS="${LDFLAGS}" STRIP=""
 		find -name Makefile -exec sed -i "{}" \