pkg-config files in qt5 beta 1 conflict with qt4

The pkg-config files which are installed while building qt5 beta 1 have exactly the same file names as their qt4 counterparts. This makes it impossible to have development files for both qt4 and qt5 installed at the same time.

Here's a list of conflicting .pc files:
QtCore.pc
QtDBus.pc
QtGui.pc
QtNetwork.pc
QtOpenGL.pc
QtSql.pc
QtTest.pc
QtXml.pc

My proposal would be to rename these files in qt5 so that they contain '5' in their file names