fdo#75376: configure: disable LTO by default for MSVC too

MSVC 2010 LTO triggers some bug in painting Writer documents;
unfortunately it's not possible to put a VCVER check in there to enable
LTO by default only for MSVC2012 because the compiler detection actually
uses the ENABLE_LTO value.

Change-Id: I29ecdd552d8a8bbd673a844e6bf0c938a98825c2