make: Adding support for building json-c with meson

Adding meson build files for json-c that work similarly to the cmake build files.
Where it made sense, I reused existing cmake .h.in files or generated entirely from meson.
All tests were done with GCC and Clang in ubuntu 24.04, Windows using MSVC 2022 and Clang-cl from llvm's repo using version 21.1.3

Signed-off-by: Tyler Erickson <tyler.erickson@seagate.com>

tests/meson.build

@@ -0,0 +1,65 @@
+test_includes = include_directories('.')
+test_deps = [jsonc_dep]
+
+# List of test sources and expected output files
+test_cases = [
+  ['test1', 'test1.expected'],
+  ['test2', 'test2.expected'],
+  ['test4', 'test4.expected'],
+  ['testReplaceExisting', 'testReplaceExisting.expected'],
+  ['test_cast', 'test_cast.expected'],
+  ['test_charcase', 'test_charcase.expected'],
+  ['test_compare', 'test_compare.expected'],
+  ['test_deep_copy', 'test_deep_copy.expected'],
+  ['test_double_serializer', 'test_double_serializer.expected'],
+  ['test_float', 'test_float.expected'],
+  ['test_int_add', 'test_int_add.expected'],
+  ['test_int_get', 'test_int_get.expected'],
+  ['test_locale', 'test_locale.expected'],
+  ['test_null', 'test_null.expected'],
+  ['test_parse', 'test_parse.expected'],
+  ['test_parse_int64', 'test_parse_int64.expected'],
+  ['test_printbuf', 'test_printbuf.expected'],
+  ['test_set_serializer', 'test_set_serializer.expected'],
+  ['test_set_value', 'test_set_value.expected'],
+  ['test_strerror', 'test_strerror.expected'],
+  ['test_util_file', 'test_util_file.expected'],
+  ['test_visit', 'test_visit.expected'],
+  ['test_object_iterator', 'test_object_iterator.expected'],
+  ['test_json_pointer', 'test_json_pointer.expected'],
+  ['test_json_patch', 'test_json_patch.expected'],
+]
+
+# Copy expected files and test data
+expected_files = []
+foreach t : test_cases
+  expected_files += t[1]
+endforeach
+
+foreach f : expected_files + ['valid.json', 'valid_nested.json', 'json_patch_spec_tests.json', 'json_patch_tests.json']
+  configure_file(input: f, output: f, copy: true)
+endforeach
+
+# Build and register tests
+special_args = {
+  'test_json_patch': ['.'],
+  'test_util_file': ['.'],
+}
+
+testdir = meson.current_build_dir()
+message('Test data directory: ' + testdir)
+
+foreach t : test_cases
+  name = t[0]
+  expected = t[1]
+  exe = executable(name, name + '.c',
+    include_directories: test_includes,
+    dependencies: test_deps
+  )
+
+  test(name, exe,
+    args: special_args.get(name, []),
+    env: ['EXPECTED_FILE=' + meson.current_build_dir() / expected],
+    workdir: testdir
+  )
+endforeach