bin/47068: unifdef(1) with cpp directive on last line without newline

[njoly%pasteur.fr@localhost]

>Number:         47068
>Category:       bin
>Synopsis:       unifdef(1) with cpp directive on last line without newline
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Oct 13 16:50:01 +0000 2012
>Originator:     Nicolas Joly
>Release:        NetBSD 6.99.12
>Organization:
Institut Pasteur
>Environment:
System: NetBSD lanfeust.sis.pasteur.fr 6.99.12 NetBSD 6.99.12 (LANFEUST) #7: 
Sat Oct 13 10:03:30 CEST 2012 
njoly%lanfeust.sis.pasteur.fr@localhost:/local/src/NetBSD/obj.amd64/sys/arch/amd64/compile/LANFEUST
 amd64
Architecture: x86_64
Machine: amd64
>Description:
unifdef(1) crash when a source file has a cpp directive on the last line but
miss a newline.
>How-To-Repeat:

njoly@lanfeust [~]> printf '#ifdef foo\n#endif' >input  
njoly@lanfeust [~]> unifdef -Ubar input
#ifdef foo
zsh: abort (core dumped)  unifdef -Ubar input

njoly@lanfeust [~]> printf '#ifdef foo\n#endif\n' >input
njoly@lanfeust [~]> unifdef -Ubar input
#ifdef foo
#endif

>Fix: