Remove prompt to exit in all programs

Signed-off-by: José Simões <jose.simoes@eclo.solutions>

programs/hash/generic_sum.c

@@ -192,11 +192,6 @@ int main( int argc, char *argv[] )
             list++;
         }
 
-#if defined(_WIN32)
-        mbedtls_printf( "\n  Press Enter to exit this program.\n" );
-        fflush( stdout ); getchar();
-#endif
-
         mbedtls_exit( exit_code );
     }