Add incomplet long double math support to libmingwex.a

winsup/mingw/mingwex/math/fpclassifyl.c

@@ -0,0 +1,10 @@
+#include <math.h>
+int __fpclassifyl (long double _x){
+  unsigned short sw;
+  __asm__ (
+	"fxam; fstsw %%ax;"
+	: "=a" (sw)
+	: "t" (_x)
+	);
+  return sw & (FP_NAN | FP_NORMAL | FP_ZERO );
+}