[flang][examples] remove unnecessary PASUE stamtment

[sunshaoce]

Summary

The program accepts an input number, performs output, and then PAUSE.
After PAUSE, the program will exit directly. So I think PAUSE can be deleted.
Or am I misunderstanding something?

[clementval]

I think you can leave the example as is.

flang/examples/ExternalHelloWorld/external-hello.cpp

void input1() {
   IONAME(OutputInteger64)(io, n);
   IONAME(EndIoStatement)(io);
 }
 
 int main(int argc, const char *argv[], const char *envp[]) {
   RTNAME(ProgramStart)(argc, argv, envp, nullptr);
   output1();
   input1();
-  RTNAME(PauseStatement)();
   RTNAME(ProgramEndStatement)();
   return 0;
 }