Update Json-c from 0.11 to 0.12

3P/json/math_compat.h

@@ -0,0 +1,28 @@
+#ifndef __math_compat_h
+#define __math_compat_h
+
+/* Define isnan and isinf on Windows/MSVC */
+
+#ifndef HAVE_DECL_ISNAN
+# ifdef HAVE_DECL__ISNAN
+#include <float.h>
+#define isnan(x) _isnan(x)
+# endif
+#endif
+
+#ifndef HAVE_DECL_ISINF
+# ifdef HAVE_DECL__FINITE
+#include <float.h>
+#define isinf(x) (!_finite(x))
+# endif
+#endif
+
+#ifndef HAVE_DECL_NAN
+#error This platform does not have nan()
+#endif
+
+#ifndef HAVE_DECL_INFINITY
+#error This platform does not have INFINITY
+#endif
+
+#endif