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

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

Misc/NEWS

@@ -68,6 +68,9 @@ Library
 Build
 -----
 
+- Issue #20221: Removed conflicting (or circular) hypot definition when
+  compiled with VS 2010 or above.  Initial patch by Tabrez Mohammed.
+
 - Issue #20609: Restored the ability to build 64-bit Windows binaries on
   32-bit Windows, which was broken by the change in issue #19788.
 

PC/pyconfig.h

@@ -207,7 +207,11 @@ 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
 
 /* Side by Side assemblies supported in VS 2005 and VS 2008 but not 2010*/
 #if _MSC_VER >= 1400 && _MSC_VER < 1600