Fix test__get_dtype test expecting little-endian (#20662)
Fix test__get_dtype test expecting little-endian (#20662)

Similar to #14832, use = (native) instead of < (little-endian)
louispotok/pandas,jreback/pandas,gfyoung/pandas,harisbal/pandas,pratapvardhan/pandas,GuessWhoSamFoo/pandas,kdebrab/pandas,datapythonista/pandas,pandas-dev/pandas,cython-testbed/pandas,GuessWhoSamFoo/pandas,pratapvardhan/pandas,jreback/pandas,GuessWhoSamFoo/pandas,harisbal/pandas,TomAugspurger/pandas,kdebrab/pandas,cython-testbed/pandas,amolkahat/pandas,toobaz/pandas,MJuddBooth/pandas,cbertinato/pandas,MJuddBooth/pandas,pratapvardhan/pandas,cython-testbed/pandas,amolkahat/pandas,jreback/pandas,gfyoung/pandas,datapythonista/pandas,datapythonista/pandas,jorisvandenbossche/pandas,rs2/pandas,jreback/pandas,cbertinato/pandas,amolkahat/pandas,louispotok/pandas,pandas-dev/pandas,jorisvandenbossche/pandas,jreback/pandas,rs2/pandas,cython-testbed/pandas,harisbal/pandas,dsm054/pandas,harisbal/pandas,toobaz/pandas,kdebrab/pandas,dsm054/pandas,pandas-dev/pandas,kdebrab/pandas,gfyoung/pandas,harisbal/pandas,dsm054/pandas,jorisvandenbossche/pandas,toobaz/pandas,pandas-dev/pandas,TomAugspurger/pandas,kdebrab/pandas,TomAugspurger/pandas,amolkahat/pandas,MJuddBooth/pandas,rs2/pandas,dsm054/pandas,louispotok/pandas,pratapvardhan/pandas,cython-testbed/pandas,datapythonista/pandas,toobaz/pandas,gfyoung/pandas,GuessWhoSamFoo/pandas,toobaz/pandas,dsm054/pandas,amolkahat/pandas,louispotok/pandas,pratapvardhan/pandas,MJuddBooth/pandas,MJuddBooth/pandas,rs2/pandas,louispotok/pandas,cbertinato/pandas,cbertinato/pandas,gfyoung/pandas,TomAugspurger/pandas,cbertinato/pandas,GuessWhoSamFoo/pandas,jorisvandenbossche/pandas