json-c-0.14: Detect broken RDRAND during initialization.

Some CPUs advertise RDRAND in CPUID, but return
0xFFFFFFFF unconditionally.  To avoid locking up
later, test RDRAND during initialization, and if
it returns 0xFFFFFFFF, mark it as nonexistent.

Also fix a possible segmentation fault in CPUID check.

This commit is a squashed backport of the following
commits on the master branch:

  * 0e5bbcaa16
  * 4d36b0287d
  * 8086314026

json-c-0.14: Fix CVE-2020-12762 - json-c through 0.14 has an integer overflow and out-of-bounds write ...

This commit is a squashed backport of the following commits
on the master branch:

  * 099016b7e8
  * 77d935b7ae
  * d07b910149
  * 519dfe1591
  * a59d5acfab
  * 26f080997d

(cherry picked from commit 8b511c402b)

Move the list of contributors to the AUTHORS file.

add the list of issues& prs closed

Increase coverage

CMakeLists: do not enforce strict prototypes on Windows.

On Windows, or at least when cross-built with Mingw-w64, build fails
because strict prototype fails on an included file (thus nothing we can
do about in json-c code):

> from /home/jehan/dev/src/json-c/json_util.c:44:
> /home/jehan/.local/share/crossroad/roads/w64/json-c/include/minwindef.h:196:3: error: function declaration isn't a prototype [-Werror=strict-prototypes]
>   196 |   typedef INT_PTR (WINAPI *FARPROC) ();
>       |   ^~~~~~~
> /home/jehan/.local/share/crossroad/roads/w64/json-c/include/minwindef.h:197:3: error: function declaration isn't a prototype [-Werror=strict-prototypes]
>   197 |   typedef INT_PTR (WINAPI *NEARPROC) ();
>       |   ^~~~~~~
> /home/jehan/.local/share/crossroad/roads/w64/json-c/include/minwindef.h:198:3: error: function declaration isn't a prototype [-Werror=strict-prototypes]
>   198 |   typedef INT_PTR (WINAPI *PROC) ();
>       |   ^~~~~~~

Let's just disable the errors for Windows build.

Fix CMake tests for enforced strict prototypes.

Arraylist testcase

Enforce strict prototypes.

CMake: Install pkgconfig file in proper location by default

The default location for pkconfig files on most systems is:
  ${CMAKE_INSTALL_LIBDIR}/pkgconfig

Thus the file should get installed in there by default.

Be verbose on failing json_c_version test.

Test coverage for json_c_version.

Small cosmetics.

Small fixes to CMakeLists

Fix coveralls submission.

coveralls-cpp is dead and does not work anymore.
Fortunately there is coveralls-lcov available.

Linking with '-Bsymbolic-functions' is supported for ELF-binaries, only.