don't put QMAKE_ABSOLUTE_SOURCE_ROOT into .qmake.cache

this is oxymoronic: if a .qmake.cache is present, telling qmake the
project root is utterly pointless.
the windows variant never had this.

Change-Id: Iefc6e242ad7458dc699b955a3657f31f1ecf4c7b
Reviewed-by: Joerg Bornemann <joerg.bornemann@nokia.com>

diff --git a/configure b/configure
index 756088d..72b1fd6 100755 (executable)
--- a/configure
+++ b/configure
@@ -6727,7 +6727,6 @@ QMAKE_LIBDIR_QT  = \$\$QT_BUILD_TREE/lib
 
 include(\$\$PWD/mkspecs/qmodule.pri)
 CONFIG += $QMAKE_CONFIG dylib depend_includepath fix_output_dirs no_private_qt_headers_warning QTDIR_build
-QMAKE_ABSOLUTE_SOURCE_ROOT = \$\$QT_SOURCE_TREE
 
 EOF