non-executable script after netbsd-6 to -current update causes tool build failure.

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

I made a copy of my netbsd-6-tagged source tree using 'pax -rwpe foo bar'.
I then updated the copy to HEAD with 'cvs update -A'.

A subsequent build attempt failed with:

[...]
nbgmake[2]: Entering directory 
`/d0/build/current/obj/i386/tools/gcc/build/lto-plugin'
test -z "/d0/build/current/tools/i386/libexec/gcc/i486--netbsdelf/4.8.3" || 
/d0/nbsd/current/src/tools/gcc/../../external/gpl3/gcc/dist/lto-plugin/../install-sh
 -c -d "/d0/build/current/tools/i386/libexec/gcc/i486--netbsdelf/4.8.3"
nbgmake[2]: Nothing to be done for `install-data-am'.
sh: 
/d0/nbsd/current/src/tools/gcc/../../external/gpl3/gcc/dist/lto-plugin/../install-sh:
 permission denied
nbgmake[2]: *** [install-libexecsubLTLIBRARIES] Error 126
nbgmake[2]: Leaving directory 
`/d0/build/current/obj/i386/tools/gcc/build/lto-plugin'
nbgmake[1]: *** [install-am] Error 2
nbgmake[1]: Leaving directory 
`/d0/build/current/obj/i386/tools/gcc/build/lto-plugin'
nbgmake: *** [install-lto-plugin] Error 2
[...]

$ ls -l 
/d0/nbsd/current/src/tools/gcc/../../external/gpl3/gcc/dist/lto-plugin/../install-sh
-rw-rw-r--  1 sysop  wsrc  13663 Jun 20  2011 
/d0/nbsd/current/src/tools/gcc/../../external/gpl3/gcc/dist/lto-plugin/../install-sh

Is this another instance where a script should be run by explicit shell
invocation?

Strangely, I used this same copy-update procedure on two other systems and
did not encounter this problem on either of them.

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