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Add Makefile infrastructure and 64-bit `long double' real input data for targets switching between the IEEE 754 binary64 and IEEE 754 binary128 formats with `-mlong-double-64' and `-mlong-double-128'. Use modified output file names for the IEEE 754 binary64 format so as not to clash with the names used for IEEE 754 binary128 format tests made with common rules for the 'long double' data type. Keep input data disabled and referring to BZ #12701 for entries that are are currently incorrectly accepted as valid data, such as '0e', '0e+', '0x', '0x8p', '0x0p-', etc. Reviewed-by: Joseph Myers <josmyers@redhat.com>