qtlibinfix doesn't apply to plugins

SUMMARY:

With "-qtlibinfix" flag included in running "configure", all Qt plugins generated do not have the infix in their names.

EXAMPLE (Windows/msvc2008):

1. Run "configure -qtlibinfix abc", followed by nmake.
2. Open $QTDIR$\plugins\accessible folder and observe.

Expected:
qtaccessiblecompatwidgets_abc_4.dll
qtaccessiblecompatwidgets_abc_4.lib
qtaccessiblecompatwidgets_abc_d4.dll
qtaccessiblecompatwidgets_abc_d4.lib
qtaccessiblewidgets_abc_4.dll
qtaccessiblewidgets_abc_4.lib
qtaccessiblewidgets_abc_d4.dll
qtaccessiblewidgets_abc_d4.lib

Actual:
qtaccessiblecompatwidgets4.dll
qtaccessiblecompatwidgets4.lib
qtaccessiblecompatwidgetsd4.dll
qtaccessiblecompatwidgetsd4.lib
qtaccessiblewidgets4.dll
qtaccessiblewidgets4.lib
qtaccessiblewidgetsd4.dll
qtaccessiblewidgetsd4.lib

SUGGESTED FIX:

(Taking $QTDIR$\src\plugins\accessible\compat\compat.pro for example)
Change
"TARGET = qtaccessiblecompatwidgets"
to
"TARGET = qtaccessiblecompatwidgets$${QT_LIBINFIX}"