safe_mode changes

Hey,

I worked on a big patch for Pecl to nuke safe_mode. Before I commited 
I noticed that not all extensions in Pecl seem to have a PHP_5_1 
branch (and definitely not a PHP_5_0) branch. My patch is for HEAD as 
that's PHP 6.0 in the PHP CVS.
Any insight on how to go about this? If I just commit it seems that 
certain modules which are rolled for PHP 5.1 from HEAD would not have 
safe_mode anymore. I only want to remove it for PHP 6, not for PHP 
5.x. #ifdef would seriously suck, because one of the nice things 
about this change is that it *really* cleans up a lot of code.
Andi