libc: Add Luna-specific limits

Doesn't use up more space in the Task structure, and now we are above the Minimum Acceptable Value as defined by POSIX (20), I think.

kernel/include/thread/Task.h

@@ -4,7 +4,7 @@
 #include "memory/AddressSpace.h"
 #include "sys/elf/Image.h"
 
-#define TASK_MAX_FDS 8
+#define TASK_MAX_FDS 32
 
 struct Task
 {

libs/libc/include/luna/os-limits.h

@@ -0,0 +1,10 @@
+#ifndef _LUNA_OS_LIMITS_H
+#define _LUNA_OS_LIMITS_H
+
+#define OPEN_MAX 32
+#define ATEXIT_MAX 32
+
+#define PAGESIZE 4096
+#define PAGE_SIZE 4096
+
+#endif

libs/libc/include/stdio.h

@@ -6,6 +6,8 @@
 
 #include <bits/seek.h>
 
+#define FOPEN_MAX 32
+
 typedef struct
 {
     int f_fd;

libs/libc/include/unistd.h

@@ -3,6 +3,7 @@
 
 #include <bits/macros.h>
 #include <bits/seek.h>
+#include <luna/os-limits.h>
 #include <sys/types.h>
 
 #define STDOUT_FILENO 0