Add GCCPIE knob to configure gcc with --enable-default-pie

* This patchset add a switch to configure gcc driver with PIE defaults
* Add support for generating static PIE in gcc
* Gets rid of lot of bandaids from distro security flags file
* Adjust recipes for new way of specifying pie
* Upgrade and Fix mips build for ffmpeg along the way

The following changes since commit 059846662f1ea1c82804cfce5f91afcb2980ec8a:

mtools-native: fix Upstream-Status (2017-06-14 14:45:01 +0100)

are available in the git repository at:

git://git.openembedded.org/openembedded-core-contrib kraj/hardening-fixes
http://cgit.openembedded.org/openembedded-core-contrib/log/?h=kraj/hardening-fixes

Khem Raj (10):
gcc: Introduce a knob to configure gcc to default to PIE security_flags.inc: Delete pinnings for SECURITY_NO_PIE_CFLAGS distutils,setuptools: Delete use of SECURITY_NO_PIE_CFLAGS
ffmpeg: Upgrade to 3.3.2 stable
gobject-introspection: Disable generating static lbraries
zlib: Pass pre-calculate uname enable re-entrant flags
gcc-sanitizer: Fix build with glibc 2.26
gcc7: Enable static PIE
libunwind: We set -fPIE in security flags now if gcc is not configured
for default PIE
valgrind: Remove -no-pie from cflags

 meta/classes/distutils-common-base.bbclass         |   2 -
 meta/classes/setuptools.bbclass                    |   2 -
 meta/conf/distro/include/security_flags.inc        |  85 ++++-------
 meta/recipes-core/zlib/zlib_1.2.11.bb              |  12 +-
 meta/recipes-devtools/gcc/gcc-7.1.inc              |   2 +
 ...r-Use-stack_t-instead-of-struct-sigaltsta.patch | 160 +++++++++++++++++++++
 .../gcc/gcc-7.1/0049-gcc-Enable-static-PIE.patch   |  37 +++++
 meta/recipes-devtools/gcc/gcc-configure-common.inc |   3 +
 meta/recipes-devtools/valgrind/valgrind_3.12.0.bb  |   1 -
 .../gobject-introspection_1.50.0.bb                |   1 +
 .../ffmpeg/ffmpeg/0001-build-fix-for-mips.patch    |  44 ++++++
 .../ffmpeg/{ffmpeg_3.3.bb => ffmpeg_3.3.2.bb}      |   5 +-
 meta/recipes-support/libunwind/libunwind_1.2.bb    |   4 -
 13 files changed, 281 insertions(+), 77 deletions(-)
 create mode 100644 meta/recipes-devtools/gcc/gcc-7.1/0048-libsanitizer-Use-stack_t-instead-of-struct-sigaltsta.patch
 create mode 100644 meta/recipes-devtools/gcc/gcc-7.1/0049-gcc-Enable-static-PIE.patch
 create mode 100644 meta/recipes-multimedia/ffmpeg/ffmpeg/0001-build-fix-for-mips.patch
 rename meta/recipes-multimedia/ffmpeg/{ffmpeg_3.3.bb => ffmpeg_3.3.2.bb} (97%)

2.13.1