Makefile: assemble package file lists before calling post-build scripts

Makefile: assemble package file lists before calling post-build scripts

Post-build scripts may want to do something based on the list of files
installed by a package. However, since commit
0e2be4db8ab01d479177a3a187c22525752195ae the final packages-file-lists.txt
file is only created _after_ the post-build scripts.

Move the assembly of the file lists upwards, before the post-build scripts.

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>