libffi: Add -mno-compact-eh when compiling for Mips

Fix compilation on Mips. Resolve issues detected here:
    http://autobuild.buildroot.net/results/f0c9db496233f53c26e92294d7305aa4511ec7b3/
    http://autobuild.buildroot.net/results/8968690c248df86b040218867f92b573721e872c/
    http://autobuild.buildroot.net/results/a35db8e6a49d022133b486b12f6a8e40b3c95b6e/

Also remove previous special case handling defined in libffi.mk.

[Thomas: add Signed-off-by from Jérôme inside the patch itself.]
Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
strongswan: needs host-pkgconf

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Tested-by: Jérôme Pouiller <jezz@sysmic.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
strongswan: fix build error 'no rule to make target libtls.la'

In some strongswan configurations, an implicit dependency could be missing.
This commit patches strongswan to force this dependency when needed.

Fixes several autobuild failures, like:
http://autobuild.buildroot.net/results/643f5b33973d5b12ffe6d84254bf3be9ed81d0ad/
http://autobuild.buildroot.net/results/24bcdcb83119e416c92458fa9ff2f5269957a743/

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
manual: contribute.txt: add patch revision section

Improve the contribute manual section by adding an explanation about patch
review and version.

The section now provides advices in how to respond maintainers requests and how
to proceed on replying them.

[Thomas: further small modifications.]
Signed-off-by: Vinicius Tinti <viniciustinti@gmail.com>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
manual: tips: document how to build the manual

Signed-off-by: A.R.D. <contact@team-ard.com>
Cc: Willy Lambert <lambert.willy@gmail.com>
Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
manual: minor typos and formating fixes

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
udev: s/BR2_TOOLCHAIN_USE_THREADS/BR2_TOOLCHAIN_HAS_THREADS/

Bug fix.

Signed-off-by: Spenser Gilliland <spenser@gillilanding.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
legacy: add a legacy option for BR2_ARM_OABI

As Arnout noted, we removed the BR2_ARM_OABI option without adding the
corresponding option in Config.in.legacy, so users upgrading to
Buildroot 2013.08 with an OABI configuration would get migrated
automatically to EABI without any warning.

This commit introduces such a legacy option, so that such users would
be explicitly warned about the removal of OABI support.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>