pythongh-125150: Skip test_fma_zero_result on NetBSD due to IEE 754-2008 implementation issues (pythonGH-125151)

Skip test_fma_zero_result on NetBSD due to IEE 754-2008 implementation issues
(cherry picked from commit 92760bd)

Co-authored-by: Furkan Onder <furkanonder@protonmail.com>

Author: furkanonder

Lib/test/test_math.py

@@ -2706,7 +2706,7 @@ def test_fma_infinities(self):
     # gh-73468: On some platforms, libc fma() doesn't implement IEE 754-2008
     # properly: it doesn't use the right sign when the result is zero.
     @unittest.skipIf(
-        sys.platform.startswith(("freebsd", "wasi"))
+        sys.platform.startswith(("freebsd", "wasi", "netbsd"))
         or (sys.platform == "android" and platform.machine() == "x86_64"),
         f"this platform doesn't implement IEE 754-2008 properly")
     def test_fma_zero_result(self):