Issue #867: disallow control characters in strict mode.

Build pkg-config for msvc as well

Handle yet another out-of-memory condition.

duplocale() can return NULL, with errno set to ENOMEM.
In this case, bail out and set the current error code to
json_tokener_error_memory.

json_tokener.h: json_tokener_parse_verbose: fix typo

https://github.com/doxygen/doxygen/issues/10466

docs: micro typo in json_object_put doc

rename WIN32 to _WIN32

The latter is the proper macro defined by Windows headers.

Fixes compilation under at least clang-cl which mandates function
declarations.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

random_seed.c: add a Coverity Scan suppression

Coverity Scan warns about the use of open() after stat() being a
potential TOCTOU (Time of check time of use) issue. But here there is no
such issue.

Use execute_process instead of exec_program

Replace with `execute_process` available on v3.0+

Now saved to variable.

There are many others that show up if we were to add -Wsign-conversions,
but this is the only one using a literal constant.

json_pointer.c: initialize idx

Fix the following build failure with gcc 5:

/home/thomas/autobuild/instance-2/output-1/build/json-c-0.17/json_pointer.c: In function 'json_pointer_result_get_recursive':
/home/thomas/autobuild/instance-2/output-1/build/json-c-0.17/json_pointer.c:193:25: error: 'idx' may be used uninitialized in this function [-Werror=maybe-uninitialized]
    res->index_in_parent = idx;
                         ^

Fixes:
 - http://autobuild.buildroot.org/results/523b35a979d59121fe4e18c38171792b06233940/

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>

Add type checking for parsed objects in tokener_parse_ex_fuzzer

Resolve build issue in tokener_parse_ex_fuzzer.c

CMake: remove needless policy setting

These policies were all introduced before CMake 3.9, so they will automatically
be initialized to the new behavior when requesting a minimum version of 3.9.

Let json-c be used with obsolete compilers