support/graphs: speedup graph-depends (branch yem/graphs-from-make-2)

Hello All!

This two-patch series bring tremendous speedups to graph-depends (and to -rdepends as well) by using the newly-introduced show-dependency-tree.

The first patch is a cleanup in the PHONY rules.

The second patch is a preparatory fixup for the mandatory-deps removal.

The third patch is the actual speedup.

Changes v2 -> v3:
- fix the %-graph-rdepends (Thomas P.)
- simplify by using defaultdicts() (Thomas P.)
- return the deps and rdeps

Regards,
Yann E. MORIN.

The following changes since commit f4f7dd9557cf139f6014ada77e947152d5a82fb3

package/libssh2: security bump to latest git (2019-03-21 00:00:54 +0100)

are available in the git repository at:

git://git.buildroot.org/~ymorin/git/buildroot.git

for you to fetch changes up to e26ba891857584eb10bbfbe76ec45be8eb2551b8

support/graph-depends: use the new make-based dependency tree (2019-03-22 21:49:53 +0100)

----------------------------------------------------------------
Yann E. MORIN (3):
package/pkg-generic: mark some rule PHONY support/graph-depends: don't eliminate mandatory deps for reverse graphs support/graph-depends: use the new make-based dependency tree

 package/pkg-generic.mk        |   3 +
 support/scripts/brpkgutil.py  |  97 ++++++++++++-----------------
 support/scripts/graph-depends | 138 +++++++++---------------------------------
 3 files changed, 70 insertions(+), 168 deletions(-)

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