Remove cobjrun command

[tsh-hashimoto]

Since cobjrun command has not been maintained for a while, I would like to remove it.

Main changes

• Remove bin directory, which contains cobjrun command.
• Update Makefile.am and configure.ac to exclude bin directory from build target.
  • When I ran autoreconf, the message lib/Makefile.am:22: error: library used but 'RANLIB' is undefined displayed. So I added AC_PROG_RANLIB to lib/Makefile.am.

After making these changes, I ran cobjrun again (if usr/lib/cobjrun remained, remove it).
It could be confirmed that cobjrun is not available.

$ cobjrun
Command 'cobjrun' not found, did you mean:
  command 'cobcrun' from deb gnucobol3 (3.1.2-5)
  command 'cobcrun' from deb gnucobol4 (4.0~early~20200606-6)
Try: sudo apt install <deb name>

[yutaro-sakamoto]

As I discussed with you earlier, we have decided to keep cobjrun.

[tsh-hashimoto]

I understood, thanks.
But, as in Issue#514, cobjrun has a problem that options are not output correctly.
If we keep cobjrun, we have to fix this problem.

[yutaro-sakamoto]

The priority of fixing cobjrun is low.
We will resolve other issues first.

[tsh-hashimoto]

OK, thanks!