contribs: remove unused files

extras/contrib/src/Patches/QtCore.pc.in

-prefix=@@PREFIX@@
-exec_prefix=${prefix}
-libdir=${prefix}/lib
-includedir=${prefix}/include/qt4/QtCore
-
-Name: Qtcore
-Description: Qtcore Library
-Version: @@VERSION@@
-Libs: -Wl,--subsystem,windows -mwindows -L${libdir} -lQtCore4 -lrpcrt4 -loleaut32 -lole32 -luuid -lwinspool -lwinmm -lshell32 -lcomctl32 -ladvapi32 -lgdi32 -limm32 -lwsock32  
-Cflags: -I${prefix}/include/qt4 -I${includedir} -DQT_NODLL

extras/contrib/src/Patches/QtGui.pc.in

-prefix=@@PREFIX@@
-exec_prefix=${prefix}
-libdir=${prefix}/lib
-includedir=${prefix}/include/qt4/QtGui
-
-Name: Qtgui
-Description: Qtgui Library
-Version: @@VERSION@@
-Libs: -Wl,--subsystem,windows -mwindows -L${libdir} -lQtGui4 -lQtCore4 -lrpcrt4 -loleaut32 -lole32 -luuid -lwinspool -lwinmm -lshell32 -lcomctl32 -lcomdlg32 -ladvapi32 -lgdi32 -limm32 -lwsock32  
-Cflags: -I${prefix}/include/qt4 -I${includedir} -DQT_NODLL