json-c: Add json_object_iterator.h to installed headers

json_object_iterator.h is not installed in staging directory.
This leads to an error during pulseaudio build process:

fatal error: json_object_iterator.h: No such file or directory

Fixes autobuild failures like:
http://autobuild.buildroot.org/results/079f9265cd768f88ad57f6f7b794641c845f3079

Signed-off-by: Gilles Talis <gilles.talis@gmail.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
graph-depends: ignore the 'target-post-image' target

Since the introduction of the post-image mechanism, the graph-depends
script is broken: it tries to call 'make
target-post-image-show-depends', which doesn't exist since
'target-post-image' is not a package.

So we should simply ignore this 'target-post-image'.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
pcre: add support for 16 bits and 32 bits variants

Until now, we have been building only the 8bits PCRE variant. However,
Qt5 requires the 16bits variant. This commit therefore adds support to
build the 16bits and 32bits variants of PCRE. In order to preserve
backward compatibility, the 8bits variant is automatically chosen if
no specific variant is defined.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
x11r7/xcb-util: bump to 0.3.9

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
package: create virtual package for libGLES, libOpenVG and libEGL

Those acceleration libraries typically have multiple implementations:
some are free (Mesa), some are proprietary (generally SoC specific).

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
rpi-userland: provides OpenGL ES, EGL and OpenVG

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Merge branch 'master' of git://git.buildroot.net/buildroot