Relax for aarch64

[remicollet]

========DIFF========
--
       ["minutes"]=>
       int(14)
       ["seconds"]=>
007-   float(11.49337267273%d)
007+   float(11.493372672740634)
       ["direction"]=>
       string(1) "N"
     }
--
========DONE========
FAIL OSGB36 to WGS84 [tests/OSGB36_to_WGS84.phpt]