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    IOStream: Fix check for compiler 'long long' support · 1643507a
    Brad King authored
    In commit bf7f0ddc (Fix KWSys FundamentalType for Universal Binaries,
    2009-11-20) we repurposed CMake variables "KWSYS_SIZEOF_${type}" and
    dropped use of them from configured headers.  However, use of one was
    accidentally left in "IOStream.hxx.in" to record whether the compiler
    supports 'long long'.  Replace it with a better test.
    
    Without this, "@KWSYS_SIZEOF_LONG_LONG@" is replaced with "TRUE" which
    the preprocessor may evaluate as "0" or "1" depending on whether a
    "TRUE" macro is defined.
    
    Change-Id: I8d3e1d3fc5b80ed440dbb8cebd6231068dfbd491
    1643507a