Log Message:
Update qt4 packages to 4.8.6.

Qt 4.8.6 provides overall over 200 improvements and bug fixes, for
example:

    Security Fix for XML Entity Expansion Denial of Service (the
    "Billion Laughs" attack)
    Better support for Mac OS X 10.9 Mavericks
    Many customer requested bug fixes, for example QTBUG-15116,
    QTBUG-21371, QTBUG-8990, QTBUG-28601, QTBUG-20946, QTBUG-30276,
    QTBUG-29572 and QTBUG-13237 (just to name a few)
    MinGW binary packages are now built with MinGW-w64 based
    toolchain with gcc 4.8.2
    Basque translation added and many other translations improved