Remove enums from bitfield, since all compilers do not support them.

Without this change, the softkey functionality is broken in Symbian
emulator. What happens is that QAction::NegativeSoftkey enum turns
out to negative value (-2) in
QSoftKeyManagerPrivateS60::highestPrioritySoftkey comparision:

    if (action->softKeyRole() == role)

In essence comparision gets executed as if (-2 == 2), which is false
and negative softkey will never get displayed. There has been similar
problems in XmlPatterns with MSVC in the past [1].

Apparently also Nokia X86 compiler does not support enums in bitfield,
actually even C++ standard support is unclear - see [2]. In HW
builds the problem does not occur since RVCT has extended support for
enums in bitfield [3].

[1] http://qt.gitorious.org/qt/qt/blobs/4.7/src/xmlpatterns/acceltree/qacceltree_p.h#line212
[2] http://www.velocityreviews.com/forums/t317473-bitfield-and-enum-is-this-legal.html
[3] http://www.keil.com/support/man/docs/armccref/armccref_ciaiabid.htm

Reviewed-By: Thierry Bastian
Reviewed-By: Janne Koskinen

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