kern/55037: built-in compat_netbsd32 doesn't handle a.out image from NetBSD-0.9

[paul%whooppee.com@localhost]

>Number:         55037
>Category:       kern
>Synopsis:       built-in compat_netbsd32 doesn't handle a.out image from NetBSD-0.9
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 01 16:40:00 +0000 2020
>Originator:     Paul Goyette
>Release:        NetBSD 9.99.46
>Organization:
+--------------------+--------------------------+-----------------------+
| Paul Goyette       | PGP Key fingerprint:     | E-mail addresses:     |
| (Retired)          | FA29 0E3B 35AF E8AE 6651 | paul%whooppee.com@localhost     |
| Software Developer | 0786 F758 55DE 53BA 7731 | pgoyette%netbsd.org@localhost   |
+--------------------+--------------------------+-----------------------+
>Environment:
	
	
System: NetBSD speedy.whooppee.com 9.99.46 NetBSD 9.99.46 (SPEEDY 2020-02-07 16:26:35 UTC) #1: Fri Feb 7 19:37:58 UTC 2020 paul%speedy.whooppee.com@localhost:/build/netbsd-local/obj/amd64/sys/arch/amd64/compile/SPEEDY amd64
Architecture: x86_64
Machine: amd64
>Description:
	Existing built-in compat_netbsd32 code doesn't handle a.out
	images.

	Built-in compat_netbsd32 module is built _without_ having
	EXEC_AOUT defined, so the a.out execsw doesn't get defined,
	and check_exec() doesn't find a match.  It therefore returns
	ENOEXEC
	
>How-To-Repeat:
	Build a stock GENERIC kernel and try to run a static image
	from NetBSD-i386 version 0.9
	
>Fix:
	

>Unformatted: