WinCvt: fixing MSVC build with including windows.h

src/RagePhoto.cpp

@@ -33,6 +33,7 @@
 #elif defined UNICODE_ICONV
 #include <iconv.h>
 #elif defined UNICODE_WINCVT
+#include <windows.h>
 #include <stringapiset.h>
 #endif
 

tests/WincvtTest.cpp

@@ -17,6 +17,7 @@
 *****************************************************************************/
 
 #include <cstring>
+#include <windows.h>
 #include <stringapiset.h>
 
 int main(int argc, char *argv[])