Fix unwanted C++ symbols mangling in the kernel module API userland emulation

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3264 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/kits/net/new_stack/userland_modules.cpp

@@ -86,6 +86,8 @@ static int32 g_next_module_id = 1;
 // Public routines
 // ---------------
 
+extern "C" {
+
 _EXPORT status_t get_module(const char * name, module_info ** mi)
 {
 	status_t status;
@@ -398,6 +400,8 @@ _EXPORT thread_id spawn_kernel_thread(thread_entry func, const char *name, long
 	return spawn_thread(func, name, priority, arg);
 }
 
+}  // extern "C"
+
 
 // #pragma mark -
 // Private routines