Remove some *.dsp/*.dsw leftovers

Usage of this was removed via 4b3e198

Closes GH-4408

Author: petk

.gitignore

@@ -208,7 +208,6 @@ php
 /win32/*.positions
 /win32/*.suo
 /win32/ext
-/win32/phpts.def
 /win32/wsyslog.h
 
 # Standard object files generated by Visual Studio