v0.2.5
Fix init_async_runtime() on Linux: explicitly open Mojo runtime library.
On Linux, Node.js loads .node addons with dlopen(RTLD_LOCAL), so
dlsym(RTLD_DEFAULT) couldn't find KGEN_CompilerRT_AsyncRT_CreateRuntime.
Now explicitly opens libKGENCompilerRTShared by name, resolved via the
RUNPATH that mojo build embeds in the shared library.