meson: use correct module file extension on macOS
GModule requires the .so file extension on macOS for historic reasons. However Meson defaults to .dylib for modules, so we need to override it to get the correct extension.
Fixes #3645 (closed).
GModule requires the .so file extension on macOS for historic reasons. However Meson defaults to .dylib for modules, so we need to override it to get the correct extension.
Fixes #3645 (closed).