add $$system_path() & $$shell_path() functions
add $$system_path() & $$shell_path() functions

follow suit with qmake ...

Change-Id: I41ceb93b234eafd5202c618a7af36e35278ad79f
Reviewed-by: Daniel Teske <d8a411aec9a206efedb4d45b75fe8d13f1e2b628@nokia.com>
Reviewed-by: Oswald Buddenhagen <6a8868beda3e139b5ac22b2534a23d3e6ba81819@nokia.com>

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