tests: Fix the expected bin dump of NaN for mips and hppa architectures.

[cdluminate]

The build fails on mips64el and hppa due to the decimal dump of the testnestedflatbuffer does not match with the hard coded expectation. See the build log as follows:

https://buildd.debian.org/status/fetch.php?pkg=flatbuffers&arch=mips64el&ver=23.5.26%2Bdfsg-1%7Eexp0&stamp=1696723928&raw=0

According to tests/is_quiet_nan.h, the binary value for mips and hppa architectures is 0x7FBFFFFFu, instead of 0x7FC00000u like amd64. Thus, the expected decimal dump should be 255 (FF), 255 (FF), 191 (BF), 127 (7F) instead of 0 (00), 0 (00), 192 (C0), 127 (7F) in little endian format.

[cdluminate]

See https://github.com/google/flatbuffers/pull/6029 for reference.

[cdluminate]

With this patch, flatbuffers can be successfully built for mips64el and hppa architectures. https://buildd.debian.org/status/package.php?p=flatbuffers