use eaccess to determine permissions for ffwp. closes #2

src/fs.cpp

@@ -221,11 +221,16 @@ namespace fs
           iter = beginiter; iter != enditer; ++iter)
       {
         int    rv;
-        struct stat st;
         string path;
 
         path = make_path(*iter,suffix);
-        rv   = ::lstat(path.c_str(),&st);
+        rv = ::eaccess(path.c_str(),R_OK);
+        if(rv == 0)
+          return Path(*iter,path);
+        rv = ::eaccess(path.c_str(),W_OK);
+        if(rv == 0)
+          return Path(*iter,path);
+        rv = ::eaccess(path.c_str(),X_OK);
         if(rv == 0)
           return Path(*iter,path);
       }