Fix wheel import problem in macosx

Kudos to @davidrudlstorfer for identifying the fix in #516.

Author: biojppm

api/CMakeLists.txt

@@ -102,6 +102,8 @@ if(RYML_BUILD_API_PYTHON)
         RUNTIME_OUTPUT_DIRECTORY "${r}")
     if(WIN32)
         target_compile_definitions(${t} PUBLIC __WIN32__)
+    elseif(APPLE)
+        set_property(TARGET ${t} APPEND PROPERTY LINK_FLAGS "-flat_namespace")
     endif()
     c4_get_transitive_property(ryml COMPILE_DEFINITIONS ryml_defs)
     target_compile_definitions(${t} PUBLIC ${RYML_SWIG_ARCH_DEFINES} ${ryml_defs})

changelog/current.md

@@ -30,4 +30,9 @@
     ```
 - [PR#501](https://github.com/biojppm/rapidyaml/pull/501): fix missing tag in `- !!seq []`.
 - [PR#508](https://github.com/biojppm/rapidyaml/pull/508): fix build with cmake 4.
-- [PR#517](https://github.com/biojppm/rapidyaml/pull/517): fix python wheels for windows.
+- [PR#517](https://github.com/biojppm/rapidyaml/pull/517) (fixes [#516](https://github.com/biojppm/rapidyaml/issues/516)): fix python wheels for windows and macosx.
+
+
+### Thanks
+
+- @davidrudlstorfer