Move to new processctl syscall, share common kernel and ulib headers

kernel/proc/proc.c

@@ -9,7 +9,7 @@
 #include "util/util.h"
 #include "kprintf.h"
 #include "elf.h"
-#include "errors.h"
+#include "hdrs/errors.h"
 #include "vfs/vfs.h"
 #include "bootinfo/bootinfo.h"
 

kernel/proc/proc.h

@@ -50,6 +50,7 @@ Proc *proc_spawnkern(void (*ent)(void), char *name);
 Proc *proc_spawnuser(char *mountpoint, char *path);
 void proc_sched(void *cpustate);
 void proc_killself(void);
+void proc_kill(Proc *proc);
 
 #define PROC_DIE() \
   do { \