Issue #20221: Removed conflicting (or circular) hypot definition

when compiled with VS 2010 or above.  Initial patch by Tabrez Mohammed.

Misc/NEWS

@@ -263,6 +263,9 @@ Tests
 Build
 -----
 
+- Issue #20221: Removed conflicting (or circular) hypot definition when
+  compiled with VS 2010 or above.  Initial patch by Tabrez Mohammed.
+
 - Issue #16537: Check whether self.extensions is empty in setup.py. Patch by
   Jonathan Hosmer.
 

PC/pyconfig.h

@@ -217,7 +217,11 @@ typedef int pid_t;
 #define Py_IS_INFINITY(X) (!_finite(X) && !_isnan(X))
 #define Py_IS_FINITE(X) _finite(X)
 #define copysign _copysign
+
+/* VS 2010 and above already defines hypot as _hypot */
+#if _MSC_VER < 1600
 #define hypot _hypot
+#endif
 
 #endif /* _MSC_VER */