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libc: Fix fopen default file mode

The Linux syscall takes a third argument for file mode opening.

--- a/src/libc/stdio/_fpopen.c

+++ b/src/libc/stdio/_fpopen.c

@@ -53,7 +53,7 @@

 		return NULL;

 	}

-	if ((fd = _open(fname, flags)) < 0)

+	if ((fd = _open(fname, flags, 0666)) < 0)

 		return NULL;

 	fp->buf = NULL;

--- a/src/libc/syscall.h

+++ b/src/libc/syscall.h

@@ -1,5 +1,5 @@

 extern void *_brk(void *addr);

-extern int _open(const char *path, int flags);

+extern int _open(const char *path, int flags, int mode);

 extern int _close(int fd);

 extern int _read(int fd, void *buf, size_t n);

 extern int _write(int fd, void *buf, size_t n);