Fix typo from #18917 (#18922)

Author: kripken

emcc.py

@@ -2405,7 +2405,7 @@ def phase_linker_setup(options, state, newargs):
       settings.DEFAULT_LIBRARY_FUNCS_TO_INCLUDE += ['$runtimeKeepalivePush']
   else:
     if settings.PROXY_TO_PTHREAD:
-      exit_with_error('-sPROXY_TO_PTHREAD requires -pthread work!')
+      exit_with_error('-sPROXY_TO_PTHREAD requires -pthread to work!')
     settings.JS_LIBRARIES.append((0, 'library_pthread_stub.js'))
 
   # TODO: Move this into the library JS file once it becomes possible.