build-system: Don't auto-clean build dir on repeated failure.
This was needed prior to CMake (and for some time as we were porting to CMake) so that a wedged build system had at least a hope of eventually being corrected. This interferes with other use cases however and since CMake is really good nowadays at generating valid build systems, remove this behavior. Users can still pass --refresh-build when desired. Fixes #30.
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