perl 5.003_03: Configure

Relaxed warning about ksh on exotic machines.

Changed usesafe to useopcode.

Add search for gzip and zip.

Look more carefully for $sh (the Bourne-ish shell).
Use that info to set $startsh correctly.

Change prompts for PerlIO interface.  See INSTALL
for how this is supposed to work.  The default is
still the same as in 5.003_02, namely don't use
any fancy new PerlIO stuff.

Don't look for sigvec() since we don't actually use it.
(Plus, it used to print an alarming misleading message about
race conditions.)

Look for stdio's _filbuf under the possible names of
_filbuf, __filbuf, and _fill.

New $useshrplib variable to control whether we build a shared
libperl.so.  The name of the library is in $libperl.
Always install it in $installarchlib/CORE/$libperl.

Check for <sys/resource.h> and <sys/wait.h> for NetBSD.

Replace old $altmake stuff with newer autoconf-ish
$make_set_make, which checks if $make sets $(MAKE).  Now you
choose an alternate make with sh Configure -Dmake=gmake (or
whatever).

Remove 'ln' for the list of essential commands.  Simulate
it with 'cp' if necessary.

Change `logname` prompts to handle extra gratuitous spaces in
Ultrix output.

Autodetect os2.

Fix silly bug in checking for fully-qualified names in /etc/hosts.

Generalize Gconvert tests.  Give correct and more useful
error messages.

Use $obj_ext instead of literal '.o' in the dynaloader test.

Include appropriate header files in bcopy() and memcpy()
tests.  Note whether memmove is available.

Check whether struct sigaction works (needed for Solaris 2.5
with -Xc).

Include appropriate header files for randbits test.

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