ToolChains: Do not list ToolChains removed by the sdktool
ToolChains: Do not list ToolChains removed by the sdktool

Remove ToolChains removed by the sdktool from user settings. This
prevents them from being created again.

Task-number: QTCREATORBUG-12751
Change-Id: I61b77acb6ab12815d3b09bd766ba44301c517aed
Reviewed-by: Tobias Hunger <012f8d714267bccc9d4766fbeace9f175fcc70c4@theqtcompany.com>

martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,Distrotech/qtcreator,farseerri/git_code,kuba1/qtcreator,xianian/qt-creator,kuba1/qtcreator,kuba1/qtcreator,danimo/qt-creator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,kuba1/qtcreator,danimo/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,xianian/qt-creator,kuba1/qtcreator,farseerri/git_code,amyvmiwei/qt-creator,Distrotech/qtcreator,martyone/sailfish-qtcreator,farseerri/git_code,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,xianian/qt-creator,Distrotech/qtcreator,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,farseerri/git_code,Distrotech/qtcreator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,danimo/qt-creator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,farseerri/git_code,kuba1/qtcreator,farseerri/git_code,Distrotech/qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator,Distrotech/qtcreator,amyvmiwei/qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,Distrotech/qtcreator,xianian/qt-creator,xianian/qt-creator,farseerri/git_code,amyvmiwei/qt-creator,xianian/qt-creator,danimo/qt-creator,danimo/qt-creator,danimo/qt-creator,amyvmiwei/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,danimo/qt-creator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,xianian/qt-creator,kuba1/qtcreator,danimo/qt-creator,farseerri/git_code,amyvmiwei/qt-creator