Fix Linux --enable-online-update-mar build

...after 13595f6220095d120e13ccb6fbfac1de4c803fe7 "Fix
--enable-online-update-mar on Windows"

Change-Id: I8e13a3f4234f3b5fb64d606eb3c2c16611dacd33
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/160491
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <stephan.bergmann@allotropia.de>
(cherry picked from commit 2e92f184f025e99d51542722f0398c33a3d146f1)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/160475
diff --git a/desktop/source/app/updater.cxx b/desktop/source/app/updater.cxx
index bdd232b..5596028 100644
--- a/desktop/source/app/updater.cxx
+++ b/desktop/source/app/updater.cxx
@@ -141,9 +141,11 @@ void CopyUpdaterToTempDir(const OUString& rInstallDirURL, const OUString& rTempD
#ifdef UNX
typedef char CharT;
#define tstrncpy std::strncpy
char const * toStream(char const * s) { return s; }
#elif defined(_WIN32)
typedef wchar_t CharT;
#define tstrncpy std::wcsncpy
OUString toStream(wchar_t const * s) { return OUString(o3tl::toU(s)); }
#else
#error "Need an implementation"
#endif
@@ -317,7 +319,7 @@ bool update()
        SAL_WARN("desktop.updater", "Updater executable path: " << aUpdaterPath);
        for (size_t i = 0; i < 8 + rtl_getAppCommandArgCount(); ++i)
        {
            SAL_WARN("desktop.updater", OUString(o3tl::toU(pArgs[i])));
            SAL_WARN("desktop.updater", toStream(pArgs[i]));
        }
        bSuccess = false;
    }