tools: try to work around DavGetHTTPFromUNCPath() not URL-encoding path

This was added in commit 20b1e6440a
"tdf#126121: WebDAV redirection detection" and it works fine when i test
it on my local Windows 10, returning an URL with encoded path.

The logs from the customer system however show a http URL containing an
unencoded ' ' in the path, which curl_url_set chokes on.

Try to encode the returned URL with rtl_UriEncodeKeepEscapes, which
should hopefully work in either situation.

Change-Id: I6862fe0828307a13b0004b192153747d85bb3a42
(cherry picked from commit 66e25aad35cf538da86bdd0157428f4bed95258d)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/137173
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

tools/source/fsys/fileutil.cxx

@@ -10,6 +10,7 @@
 #include <tools/fileutil.hxx>
 #if defined _WIN32
 #include <osl/file.hxx>
+#include <rtl/uri.hxx>
 #include <o3tl/char16_t2wchar_t.hxx>
 #define WIN32_LEAN_AND_MEAN
 #include <Windows.h>
@@ -29,7 +30,11 @@ OUString UNCToDavURL(LPCWSTR sUNC)
         bufURL = std::make_unique<wchar_t[]>(nSize);
         nResult = DavGetHTTPFromUNCPath(sUNC, bufURL.get(), &nSize);
     }
-    return nResult == ERROR_SUCCESS ? OUString(o3tl::toU(bufURL.get())) : OUString();
+    // looks like on different Windowses this may or may not be URL encoded?
+    return nResult == ERROR_SUCCESS
+               ? ::rtl::Uri::encode(OUString(o3tl::toU(bufURL.get())), rtl_UriCharClassUric,
+                                    rtl_UriEncodeKeepEscapes, RTL_TEXTENCODING_UTF8)
+               : OUString();
 }
 #endif
 }