Silence warning about strdup() being deprecated

host/libhackrf/src/hackrf.c

@@ -30,6 +30,11 @@ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSI
 #ifdef _WIN32
 /* Avoid redefinition of timespec from time.h (included by libusb.h) */
 #define HAVE_STRUCT_TIMESPEC 1
+
+/* Stop MSVC complaining about strdup()
+ * Sure, we could fix this another way if strdup() is ever deprecated
+ */
+#define _CRT_NONSTDC_NO_DEPRECATE 1
 #endif
 #include <pthread.h>