Disable the clearing of FPU exceptions on platforms that do not support it

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>

src/CoolPropLib.cpp

@@ -23,7 +23,7 @@ void reset_fpu()
 {
     #if defined(_MSC_VER)
         _clearfp(); // For MSVC, clear the floating point error flags
-    #else
+    #elif defined(FE_ALL_EXCEPT)
         feclearexcept(FE_ALL_EXCEPT);
     #endif
 }