Fix gdb crash due to SIGPIPE when the compile command fails

Due to the SIGPIPE the gdb process is killed here, which is
not helpful.

2021-06-05  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	* compile/compile.c (scoped_ignore_sigpipe): New helper class.
	(compile_to_object): Ignore SIGPIPE before calling the plugin.