Configure - move the addition of the zlib / libz lib to configs

Configure had the Unix centric addition of -lz when linking with zlib
is enabled, which doesn't work on other platforms.  Therefore, we move
it to the BASE_unix config template and add corresponding ones in the
other BASE_* config templates.  The Windows one is probably incomplete,
but that doesn't matter for the moment, as mk1mf does it's own thing
anyway.

This required making the %withargs table global, so perl snippets in
the configs can use it.

Reviewed-by: Andy Polyakov <appro@openssl.org>

Configure

diff --git a/Configure b/Configure
index 9226b90..57a57bd 100755
--- a/Configure
+++ b/Configure
@@ -138,6 +138,7 @@
 
 our %table = ();
 our %config = ();
+our %withargs = ();
 
 # Forward declarations ###############################################
 
@@ -437,7 +438,6 @@
 my $libs="";
 my $target="";
 $config{options}="";
-my %withargs=();
 my $build_prefix = "release_";
 
 my @argvcopy=@ARGV;
@@ -980,26 +980,6 @@
 	push @{$config{openssl_thread_defines}}, @thread_defines;
 	}
 
-unless ($disabled{zlib})
-	{
-	push @{$config{defines}}, "ZLIB";
-	if (defined($disabled{"zlib-dynamic"}))
-		{
-		if (defined($withargs{zlib_lib}))
-			{
-			$config{ex_libs} .= " -L" . $withargs{zlib_lib} . " -lz";
-			}
-		else
-			{
-			$config{ex_libs} .= " -lz";
-			}
-		}
-	else
-		{
-		push @{$config{defines}}, "ZLIB_SHARED";
-		}
-	}
-
 # With "deprecated" disable all deprecated features.
 if (defined($disabled{"deprecated"})) {
         $config{api} = $maxapi;