Kernel/LibC: Implement {get,set,init}groups

This allows dropping /etc/group parsing from the kernel :D

userspace/libraries/LibC/include/grp.h

@@ -14,7 +14,7 @@ __BEGIN_DECLS
 struct group
 {
 	char* gr_name;   /* The name of the group. */
-	char* gr_passwd;/* The password of the group */
+	char* gr_passwd; /* The password of the group */
 	gid_t gr_gid;    /* Numerical group ID. */
 	char** gr_mem;   /* Pointer to a null-terminated array of character pointers to member names. */
 };
@@ -27,6 +27,9 @@ struct group*	getgrnam(const char* name);
 int				getgrnam_r(const char* name, struct group* grp, char* buffer, size_t bufsize, struct group** result);
 void			setgrent(void);
 
+int				initgroups(const char* user, gid_t group);
+int				setgroups(size_t size, const gid_t list[]);
+
 __END_DECLS
 
 #endif

userspace/libraries/LibC/include/sys/syscall.h

@@ -111,6 +111,8 @@ __BEGIN_DECLS
 	O(SYS_FLOCK,			flock)			\
 	O(SYS_GET_NPROCESSOR,	get_nprocessor)	\
 	O(SYS_FUTEX,			futex)			\
+	O(SYS_GETGROUPS,		getgroups)		\
+	O(SYS_SETGROUPS,		setgroups)		\
 
 enum Syscall
 {