Don't set the compiler or linker name in the Xcode probe
Don't set the compiler or linker name in the Xcode probe

This fixes linkerMode:automatic where the linker is determined by Qbs,
and the compilerName assignment is unnecessary because the default name
is sufficient.

Change-Id: I1fce60377f03313370e60df4ab0ed163ceae4655
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@qt.io>

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