[wasm][test] WASI platform does not support injecting dynamic library

WASI does not provide any interface to inject dynamic library at
runtime and all stdlib are now always statically linked, so don't
need to inject dynamically.

Author: kateinoigakukun

test/lit.cfg

@@ -2314,7 +2314,7 @@ if run_vendor != 'apple':
 
 if 'remote_run_host' in lit_config.params:
     configure_remote_run()
-elif not kIsWindows:
+elif not kIsWindows and not run_os == 'wasi':
     if 'use_os_stdlib' in lit_config.params:
         config.available_features.add('use_os_stdlib')