0bd91ad405
Modify logic to unconditionally create an empty class list response file to instead only create the empty file if no classes are being compiled. Otherwise, the response file is created via a custom command that generates the correct list. This fixes a race condition on certain systems (e.g. HFS on OS X) where the dependency for creating the "correct" list can have the "same" (due to limited precision of the filesystem) timestamp as the empty file created at configure time, resulting in an empty class list being incorrectly used to invoke `jar` (resulting in `jar` being unhappy that it was not given any input files). Although one would have some hope that this doesn't affect "real" projects, it definitely does affect the JavaExportImport unit test, causing the same to fail randomly when run on an HFS partition.
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