do not look for mkspecs/ directories in project trees
do not look for mkspecs/ directories in project trees

this pretty surprising behavior would interfere with building the
examples from an installed qt tree with qmakes from other qt builds.

.qmake.conf (and .qmake.cache) files provide a possibility to explicitly
"anchor" project roots, so there is no point in having a second, even
more magic way to do it.

Task-number: QTBUG-35485
Change-Id: I8fd4fda67cabafdf55e7a98282dcdfaffb4a405e
Reviewed-by: Tor Arne Vestbø <455e994b14f100bcf4496f5548752c1ff193cc50@digia.com>
(cherry picked from qtbase/65a676372c533e8b35117081ec0aa1a94e1500e5)
Reviewed-by: Daniel Teske <d8a411aec9a206efedb4d45b75fe8d13f1e2b628@digia.com>

maui-packages/qt-creator,darksylinc/qt-creator,danimo/qt-creator,kuba1/qtcreator,darksylinc/qt-creator,xianian/qt-creator,colede/qtcreator,amyvmiwei/qt-creator,danimo/qt-creator,colede/qtcreator,xianian/qt-creator,darksylinc/qt-creator,amyvmiwei/qt-creator,farseerri/git_code,maui-packages/qt-creator,farseerri/git_code,AltarBeastiful/qt-creator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,omniacreator/qtcreator,Distrotech/qtcreator,omniacreator/qtcreator,kuba1/qtcreator,darksylinc/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,xianian/qt-creator,colede/qtcreator,omniacreator/qtcreator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,maui-packages/qt-creator,kuba1/qtcreator,danimo/qt-creator,colede/qtcreator,darksylinc/qt-creator,farseerri/git_code,AltarBeastiful/qt-creator,kuba1/qtcreator,Distrotech/qtcreator,martyone/sailfish-qtcreator,Distrotech/qtcreator,danimo/qt-creator,darksylinc/qt-creator,maui-packages/qt-creator,omniacreator/qtcreator,kuba1/qtcreator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,amyvmiwei/qt-creator,colede/qtcreator,amyvmiwei/qt-creator,maui-packages/qt-creator,farseerri/git_code,farseerri/git_code,omniacreator/qtcreator,danimo/qt-creator,colede/qtcreator,kuba1/qtcreator,danimo/qt-creator,Distrotech/qtcreator,Distrotech/qtcreator,AltarBeastiful/qt-creator,colede/qtcreator,xianian/qt-creator,AltarBeastiful/qt-creator,danimo/qt-creator,Distrotech/qtcreator,darksylinc/qt-creator,amyvmiwei/qt-creator,farseerri/git_code,xianian/qt-creator,danimo/qt-creator,amyvmiwei/qt-creator,omniacreator/qtcreator,xianian/qt-creator,farseerri/git_code,maui-packages/qt-creator,farseerri/git_code,darksylinc/qt-creator,kuba1/qtcreator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,maui-packages/qt-creator,omniacreator/qtcreator,AltarBeastiful/qt-creator,Distrotech/qtcreator,xianian/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator