linux/tools: move to their own package (branch yem/linux-tools)

Hello All!

This series moves the Linux tools (cpupower, perf and selftests) our of the linux package and into their own package.

As extensively explained in the commit log from the first patch, some configurations are unbuildable, because they cause circular dependencies in our Makefiles.

We fix that by moving the Linux tools to their own package.

Changes v2 -> v3:
- don't symlink the Linux sources; just build in there
- typoes

Changes v1 -> v2:
- properly handle legacy

Regards,
Yann E. MORIN.

The following changes since commit e03cb2eb2edf73b79156e8f54c80d04dc0846e89

libgtk3: fix typo (2016-09-05 23:36:04 +0200)

are available in the git repository at:

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

for you to fetch changes up to bdadcf3de3e5617f0492d88329476963a06fad44

docs/manual: update the linux tools section (2016-09-06 15:22:54 +0200)

----------------------------------------------------------------
Yann E. MORIN (2):
linux/tools: make it a real, separate package docs/manual: update the linux tools section

 Config.in.legacy                                   | 24 +++++++++++
 .../adding-packages-linux-kernel-spec-infra.txt    | 40 +++++++++---------
 linux/Config.in                                    |  2 +-
 linux/linux.mk                                     | 24 +----------
 .../linux-tools/Config.in                          | 14 +++++--
 .../linux-tools}/linux-tool-cpupower.mk            |  8 ++--
 {linux => package/linux-tools}/linux-tool-perf.mk  | 18 ++++----
 .../linux-tools}/linux-tool-selftests.mk           | 14 +++----
 package/linux-tools/linux-tools.mk                 | 48 ++++++++++++++++++++++
 9 files changed, 126 insertions(+), 66 deletions(-)
 rename linux/Config.tools.in => package/linux-tools/Config.in (83%)
 rename {linux => package/linux-tools}/linux-tool-cpupower.mk (79%)
 rename {linux => package/linux-tools}/linux-tool-perf.mk (84%)
 rename {linux => package/linux-tools}/linux-tool-selftests.mk (65%)
 create mode 100644 package/linux-tools/linux-tools.mk

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