[tlbuild] PATCH: Fix build on OpenBSD

[Karl Berry]

    -sed $1 -e '/begin code/,/end code/d' \
    -       -e '/alternate code/,/end of code/s/^% //' >$2
    +sed  -e '/begin code/,/end code/d' \
    +     -e '/alternate code/,/end of code/s/^% //' $1 >$2

Peter already made the fix yesterday.  svn update.