Visual Studio: fix feraiseexcept test failure

We have a test that checks that our own implementation of feraiseexcept
triggers an assertion failure when a non-zero argument is given.  This test
now fails since Visual Studio has in implementation for feraiseexcept in the
fenv.h header file.

This commit disables the test when using Visual Studio.

Author: kroening

regression/cbmc-library/feraiseexcept-01/main.c

@@ -1,9 +1,18 @@
 #include <assert.h>
 #include <fenv.h>
 
+int nondet_int();
+
 int main()
 {
-  int exceptions;
+  int exceptions = nondet_int();
+#ifdef _MSC_VER
+  // Visual Studio's fenv.h includes an inlined implementation of
+  // feraiseexcept, which prevents us from using the one in
+  // our library.
+  __CPROVER_assert(0, "dummy assertion");
+#else
   feraiseexcept(exceptions);
+#endif
   return 0;
 }