Add 'Linux' string to about dialog OS version info

Change-Id: I651fa1ba23e5630508d94c05202d1af7b31fb0f9
Reviewed-on: https://gerrit.libreoffice.org/20318Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>

vcl/generic/app/geninst.cxx

@@ -151,9 +151,9 @@ OUString SalGenericInstance::getOSVersion()
             // "3.16.7-29-desktop ..."
             sal_Int32 nTooDetailed = aVers.indexOf( '.', 2);
             if (nTooDetailed < 1 || nTooDetailed > 8)
-                aKernelVer = "misparse";
+                aKernelVer = "Linux (misparsed version)";
             else // "3.16.7-29-desktop ..."
-                aKernelVer = aVers.copy(0, nTooDetailed);
+                aKernelVer = "Linux " + aVers.copy(0, nTooDetailed);
         }
         fclose( pVersion );
     }