[PATCH] Fix ap_execve.c to fall back to $SHELL

[Martin Kraemer <ma...@mch.sni.de>]

Currently, ap_execve.c interprets the #!/interpreter line in shell scripts
if NEED_HASHBANG_EMUL is set (on UTS2.1, BS2000, ...).

It does that just fine, only it fails to fall back to $SHELL if a
script does NOT have a 1st line of hashbang. That was simply an omission
by me some time ago :-(  And nobody ever noticed ;-)

Here's a patch. It's not very beautiful, and I am thinking of rewriting
all the malloc() stuff to use ap_make_array() and friends. This
malloc uglyness would become much nicer, I think.
OTOH, I would have to create a ap_make_sub_pool(NULL), which isn't all
that beautiful either.

Anyway, here's a first go at the missing $SHELL call for hashbang-less
scripts:

    Martin
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