fix flonum modulo and remainder

Use fmod() instead of trying to work around imprecision in the naive algorithm. Thanks to Xsmith random testing for exposing trouble with the old implementation.
cddwx525 · Nov 3, 2020 · 6db8857 · 6db8857
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diff --git a/LOG b/LOG
@@ -2138,3 +2138,5 @@
 - adjust arm32 backend to not choose shorter instructions for larger
   return-address offsets, which breaks label address assignment
     arm32.ss
+- repair remainder and modulo on flonums by using fmod
+    prim5.c, 5_3.ss, 5_3.ms