wcs* use wchar_t on POSIX, which is not the same as WCHAR

so, winchar_* is introduced which uses WCHAR


git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@4883 212acab6-be3b-0410-9dea-997c60f758d6

Source/SConscript

@@ -23,6 +23,7 @@ makensis_files = Split("""
 	strlist.cpp
 	tokens.cpp
 	util.cpp
+	winchar.cpp
 	writer.cpp
 """)