Add shared library version of libcli_main

ports/nacl-spawn/nacl_spawn.cc

Index: ports/nacl-spawn/nacl_spawn.cc
diff --git a/ports/nacl-spawn/nacl_spawn.cc b/ports/nacl-spawn/nacl_spawn.cc
index f3a56ec22f96140e4c0c8b048080924b86dec2c6..5e0d8d22a2d633392b63cb386c9c5ab54db1395e 100644
--- a/ports/nacl-spawn/nacl_spawn.cc
+++ b/ports/nacl-spawn/nacl_spawn.cc
@@ -55,13 +55,7 @@ struct NaClSpawnReply {
 
 static std::string GetCwd() {
   char cwd[PATH_MAX + 1];
-  // TODO(hamaji): Remove this #if and always call getcwd.
-  // https://code.google.com/p/naclports/issues/detail?id=109
-#if defined(__GLIBC__)
-  if (!getwd(cwd))
-#else
   if (!getcwd(cwd, PATH_MAX))
-#endif
     assert(0);
   return cwd;
 }
@@ -288,7 +282,6 @@ static bool ExpandShBang(std::string* prog, pp::VarDictionary* req) {
 
 static bool UseBuiltInFallback(std::string* prog, pp::VarDictionary* req) {
   if (prog->find('/') == std::string::npos) {
-    bool found = false;
     const char* path_env = getenv("PATH");
     std::vector<std::string> paths;
     GetPaths(path_env, &paths);