Change encoding of ppsspp.rc

Continuing the changes in encoding that was started in https://github.com/hrydgard/ppsspp/pull/3637, I moved texts with diacritics from ppsspp.rc to other files, aboutbox.rc and version.rc.
version.rc contains metadata that Windows shows in the properties of the executable file, without executing it.
aboutbox.rc contains the dialog box that is shown in the menu "help -> about PPSSPP"
Both files are included in ppsspp.rc with "include".
Now, ppsspp.rc is encoded as ANSI and will be shown in the diff of git.