Set UTF-8 as the codepage using manifest declaration

Works on Windows 10+. This ensures any UTF-8 string we pass to
ANSI API will not get interpreted in some local code page
in effect at runtime.

Although we do not use any such API, OpenSSL dll we link to
does (e.g., the store API used for reading certificate and
key from files). OpenSSL may fix this in future versions,
but this is an easy workaround that looks harmless and appropriate.

Fixes failure to read certificates when filenames contain non-ascii
characters reported by: Carsten Mietzsch <[email protected]>

Ref: https://learn.microsoft.com/en-us/windows/apps/design/globalizing/use-utf8-code-page
Github: #920

Change-Id: Ic4e233c788b16a862c1fddcf314a3da661072fb5
Signed-off-by: Selva Nair <[email protected]>
Acked-by: Lev Stipakov <[email protected]>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1413
Message-Id: <[email protected]>
URL: https://www.mail-archive.com/[email protected]/msg34805.html
Signed-off-by: Gert Doering <[email protected]>

Author: selvanair

src/openvpn/openvpn.manifest

@@ -14,6 +14,11 @@
             <supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}"/>
         </application>
     </compatibility>
+    <application>
+        <windowsSettings>
+            <activeCodePage xmlns="http://schemas.microsoft.com/SMI/2019/WindowsSettings">UTF-8</activeCodePage>
+        </windowsSettings>
+    </application>
     <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
         <security>
             <requestedPrivileges>