relax new test for aarch64

[remicollet]

As for PR #31

========DIFF========
--
       [2]=>
       array(2) {
         [0]=>
019-     float(11.000073920872426)
019+     float(11.000073920872428)
         [1]=>
021-     float(10.035925156338873)
021+     float(10.035925156338871)
       }
       [3]=>
       array(2) {
--
         [0]=>
         float(14.431497984318062)
         [1]=>
042-     float(7.0743500242581225)
042+     float(7.074350024258123)
       }
       [6]=>
       array(2) {
--
       [8]=>
       array(2) {
         [0]=>
061-     float(12.756998952507347)
061+     float(12.756998952507345)
         [1]=>
063-     float(-1.7055449208364544)
063+     float(-1.7055449208364535)
       }
       [9]=>
       array(2) {
--
       [11]=>
       array(2) {
         [0]=>
082-     float(11.067030621797189)
082+     float(11.067030621797187)
         [1]=>
084-     float(-10.483970622513857)
084+     float(-10.483970622513855)
       }
       [12]=>
       array(2) {
--
         [0]=>
         float(8.642194115015831)
         [1]=>
112-     float(-22.172231059691807)
112+     float(-22.172231059691804)
       }
       [16]=>
       array(2) {
         [0]=>
117-     float(7.979717846837639)
117+     float(7.979717846837637)
         [1]=>
         float(-25.08894018486976)
       }
--
========DONE========
FAIL Test for "interpolate_linestring" #1 [tests/interpolate-line-string-001.phpt]