OBVIOUS Use report_unrecognized_option_error in 'demangle' and 'info macro' commands.

OBVIOUS Use report_unrecognized_option_error in 'demangle' and 'info macro' commands.

Rather than have some local logic to throw an error for an unrecognized option,
use the new cli-utils.h function throwing an error.

At the same time, fix some wrong indentation in info_macro_command
and fix a small bug in 'demangle' error handling:

Without the patch:
  (gdb) demangle -L c++ abcd
  Unrecognized option 'c++' to demangle command.  Try "help demangle".
  (gdb)

With the patch:
  (gdb) demangle -L c++ abcd
  Unrecognized option '-L' to demangle command.  Try "help demangle".

2018-10-27  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

	* macrocmd.c (info_macro_command): Use report_unrecognized_option_error
	to report a bad option and fix indentation.
	* demangle.c (demangle_command): Use report_unrecognized_option_error
	to report a bad option and correctly report the bad option.