libc: update kernel library references

lib/libc/io/stdio/fclose.c

@@ -2,7 +2,7 @@
 
 #include <errno.h>
 #include <fcntl.h>
-#include <mango/log.h>
+#include <magenta/log.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>

lib/libc/io/stdio/file.c

@@ -1,8 +1,8 @@
 #include "file.h"
 
 #include <errno.h>
-#include <mango/futex.h>
-#include <mango/log.h>
+#include <magenta/futex.h>
+#include <magenta/log.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

lib/libc/io/stdio/file.h

@@ -3,7 +3,7 @@
 
 #include "ringbuf.h"
 
-#include <mango/types.h>
+#include <magenta/types.h>
 #include <stddef.h>
 
 enum file_flags {

lib/libc/io/stdio/ringbuf.c

@@ -1,7 +1,7 @@
 #include "file.h"
 
 #include <errno.h>
-#include <mango/log.h>
+#include <magenta/log.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>