Reduce C++ main snippet.

snippets/c++-mode/main

@@ -2,16 +2,7 @@
 # name: main
 # key: main
 # --
-#include <string_view>
-#include <vector>
-
-using std::string_view;
-using std::vector;
-
 int main(${1:int argc, char *argv[]})
 {
-    ${2:const vector<string_view> args(argv, argv + argc);}
     $0
-
-    return 0;
 }