baremetal: Auto-detect GNU ARM toolchains on Windows
baremetal: Auto-detect GNU ARM toolchains on Windows

... which are installed from this site:

https: //developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm

Change-Id: Ic7e8886e53ede7b86289ef514eccd94870e17676
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@qt.io>

qt-labs/qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs