compilation failure in oqgraph after 4aaa38d2

on many builders oqgraph failed to compile because isfinite wasn't defined.

fix this mess of ifdefs/defines to work properly no matter
whether isfinite/isnan/isinf is a function or a macro
and whether stl header undefines it or not.

and remove the hackish workaround from oqgraph.

include/my_global.h

@@ -803,26 +803,35 @@ inline unsigned long long my_double2ulonglong(double d)
 #define SIZE_T_MAX      (~((size_t) 0))
 #endif
 
+#ifndef HAVE_FINITE
+#define finite(x) (1.0 / fabs(x) > 0.0)
+#endif
+
 #ifndef isfinite
-#ifdef HAVE_FINITE
 #define isfinite(x) finite(x)
-#else
-#define finite(x) (1.0 / fabs(x) > 0.0)
-#endif /* HAVE_FINITE */
-#elif (__cplusplus >= 201103L)
-#include <cmath>
-static inline bool isfinite(double x) { return std::isfinite(x); }
-#endif /* isfinite */
+#endif
 
 #ifndef HAVE_ISNAN
 #define isnan(x) ((x) != (x))
 #endif
 #define my_isnan(x) isnan(x)
 
-#ifdef HAVE_ISINF
+#ifndef HAVE_ISINF
+#define isinf(X) (!isfinite(X) && !isnan(X))
+#endif
 #define my_isinf(X) isinf(X)
-#else /* !HAVE_ISINF */
-#define my_isinf(X) (!finite(X) && !isnan(X))
+
+#ifdef __cplusplus
+#include <cmath>
+#ifndef isfinite
+#define isfinite(X) std::isfinite(X)
+#endif
+#ifndef isnan
+#define isnan(X) std::isnan(X)
+#endif
+#ifndef isinf
+#define isinf(X) std::isinf(X)
+#endif
 #endif
 
 /* Define missing math constants. */

storage/oqgraph/oqgraph_thunk.cc

@@ -28,18 +28,6 @@
 
 #include <boost/tuple/tuple.hpp>
 
-/* This is needed as boost undef's isfinite */
-#ifndef isfinite
-#ifdef HAVE_FINITE
-#define isfinite(x) finite(x)
-#else
-#define isfinite(x) (1.0 / fabs(x) > 0.0)
-#endif /* HAVE_FINITE */
-#elif (__cplusplus >= 201103L)
-#include <cmath>
-static inline bool isfinite(double x) { return std::isfinite(x); }
-#endif /* isfinite */
-
 #include "unireg.h"
 #include "sql_base.h"
 #include "table.h"