Remove prompt to exit in all programs

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

programs/ssl/dtls_client.c

@@ -346,11 +346,6 @@ exit:
     mbedtls_ctr_drbg_free( &ctr_drbg );
     mbedtls_entropy_free( &entropy );
 
-#if defined(_WIN32)
-    mbedtls_printf( "  + Press Enter to exit this program.\n" );
-    fflush( stdout ); getchar();
-#endif
-
     /* Shell can not handle large exit numbers -> 1 for errors */
     if( ret < 0 )
         ret = 1;