qt4-tools-nativesdk: fix unpack failure due to missing g++.conf
FILESPATHPKG was being used to in order to bring in linux.conf and
g++.conf in this recipe, however this probably never worked since
FILESPATHPKG always has the MACHINE appended to it and these are not
machine-specific files. The only reason it built was that these two files
could be found within the "files" subdir until we removed Qt 4.6.3.
Using FILESEXTRAPATHS (as qt4-tools-native does) solves this.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
