[m-rev.] diff: fix a problem on Cygwin

[Julien Fischer]

Fix a problem on Cygwin.

library/float.m:
    The 64-bit integer type on Cygwin is "long long int".

Julien.

diff --git a/library/float.m b/library/float.m
index f82b8ef..cfb28dd 100644
--- a/library/float.m
+++ b/library/float.m
@@ -941,7 +941,7 @@ float.float_to_doc(X) = str(string.float_to_string(X)).
     char buf[64];

     u.f = (double) Flt;
-    #if defined(MR_MINGW64)
+    #if defined(MR_MINGW64) || defined(MR_CYGWIN)
         sprintf(buf, ""%lld"", u.i);
     #else
         sprintf(buf, ""%ld"", u.i);
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