Try another work around for strdup()

appveyor.yml

@@ -29,6 +29,5 @@ build_script:
     -DPKG_CONFIG_EXECUTABLE="C:\pkg-config\bin\pkg-config.exe" \
     -DFFTW_INCLUDES=C:\fftw \
     -DFFTW_LIBRARIES=C:\fftw\libfftw3f-3.lib \
-    -D_CRT_NONSTDC_NO_DEPRECATE=1 \
     ..
   - msbuild HackRF.sln /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"

host/libhackrf/src/hackrf.c

@@ -30,6 +30,7 @@ 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
+#define strdup _strdup
 #endif
 #include <pthread.h>