WDSP: restore ANB::flush and re-enable Windows and Mac builds

CMakeLists.txt

@@ -860,7 +860,7 @@ if (FFTW3F_FOUND)
     set(FT8_SUPPORT ON CACHE INTERNAL "")
 endif()
 
-if (FFTW3F_FOUND AND LINUX)
+if (FFTW3F_FOUND)
     add_subdirectory(wdsp)
     add_definitions(-DHAS_WDSP)
     set(WDSP_SUPPORT ON CACHE INTERNAL "")

wdsp/anb.cpp

@@ -97,6 +97,11 @@ ANB::~ANB()
     delete[] wave;
 }
 
+void ANB::flush()
+{
+    initBlanker();
+}
+
 void ANB::execute()
 {
     double scale;