Xcode: Fix early termination on per-config source file error
In commit v3.1.0-rc1~687^2~4 (cmTarget: Make the source files depend on the config, 2014-02-13) an early termination case was added to the Xcode generator. Fix handling of this case to actually abort all the generation steps. Otherwise some of the later steps are attempted without the preconditions normally established by earlier steps, possibly leading to a crash.
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