Environments now belong to procgroups, modify env_set () and env_get () accordingly

kernel/proc/proc.h

@@ -7,7 +7,6 @@
 #include <libk/rbtree.h>
 #include <libk/std.h>
 #include <path_defs.h>
-#include <proc/env.h>
 #include <proc/procgroup.h>
 #include <proc/resource.h>
 #include <proc/suspension_q.h>
@@ -51,7 +50,6 @@ struct proc {
   size_t mail_recv_size;
   char cwv[VOLUME_MAX];
   struct proc_suspension_q done_sq;
-  struct proc_env env;
 };
 
 void proc_sched (bool user);