fix build after first webkit self-injection attempt

it didn't work for several reasons:
- if the configures don't add webkit to QT_CONFIG, src.pro doesn't even
  know that it needs to build WebKit at all, so WebKit would never
  inject itself into the build. hen-and-egg problem.
- the in-Qt build doesn't use WebKit.pro in the first place, so a proper
  recursive qmake would never create qt_webkit_version.pri. it worked
  under unix because configure collects all project files irrespective
  of the actual SUBDIRS structure.
- a proper recursive qmake will cache the qt config, so the injection
  wouldn't be effective during the first qmake run

so instead let the configures copy the pri file.

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