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Workaround for old autotools

nordugrid-arc-bot requested to merge ellert/arc:workaround-for-old-autotools into next

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This merge request is automatically copied from !664 (merged) orginally made by @ellert
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AC_CHECK_HEADER checks for the presence of the header (using the precompiler) and for the usability of the header (using the compiler). If the two tests disagree newer autotools versions use the result from the usability test.

However, older autotools versions (which include the version used by the nightlies) use the presence test in this situation, which screws up the logic of the xrootd test. This change reimplements the test using AC_TRY_COMPILE so that the compile test is used also when older autotools versions are used.

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