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src/aubio_priv.h: use _isnan on windows msvc 9 to avoid linking error

--- a/src/aubio_priv.h

+++ b/src/aubio_priv.h

@@ -254,6 +254,11 @@

 #define IMAG      cimagf

 #endif

+/* avoid unresolved symbol with msvc 9 */

+#if defined(_MSC_VER) && (_MSC_VER < 1900)

+#define isnan _isnan

+#endif

+

 /* handy shortcuts */

 #define DB2LIN(g) (POW(10.0,(g)*0.05f))

 #define LIN2DB(v) (20.0*LOG10(v))