qt4.inc: expand the package name for multilib case

qt4.inc: expand the package name for multilib case

in the qt4.inc python annomyous code, there is case where package name
is set to "${QT_BASE_LIB}-tool", and  FILE_${QT_BASE_LIB}-tool is set to xxx.
here QT_BASE_NAME=qt4. multilib.bbclass will try to rename the FILE_qt4_tool to
FILE_lib64_qt4_tool. unfortunately, there is only FILE_${QT_BASE}-tool, no
FILE_qt4-tool, so FILE_lib64_qt4_tool will not be defined.

to fix this issue, this patch expand the QT_BASE_LIB when assigning the package
name.

FIX [YOCTO #1344]

(From OE-Core rev: b5d381133660fe338796b965131cee39cec01b96)

Signed-off-by: Yu Ke <ke.yu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>