Replace http://man7.org links with https://man7.org links.

I suspect the way http:// dies is that browsers just interpret it as
https:// anyway, but there's no reason not to just bulk fix all these at
source.

Change-Id: I38fa91728846d7c33207ef1bdadd4910eac9e941
diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index 279c658..d99d032 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -154,7 +154,7 @@
     __warnattr("tempnam is unsafe, use mkstemp or tmpfile instead");
 
 /**
- * [rename(2)](http://man7.org/linux/man-pages/man2/rename.2.html) changes
+ * [rename(2)](https://man7.org/linux/man-pages/man2/rename.2.html) changes
  * the name or location of a file.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
@@ -162,7 +162,7 @@
 int rename(const char* _Nonnull __old_path, const char* _Nonnull __new_path);
 
 /**
- * [renameat(2)](http://man7.org/linux/man-pages/man2/renameat.2.html) changes
+ * [renameat(2)](https://man7.org/linux/man-pages/man2/renameat.2.html) changes
  * the name or location of a file, interpreting relative paths using an fd.
  *
  * Returns 0 on success, and returns -1 and sets `errno` on failure.
@@ -172,25 +172,25 @@
 #if defined(__USE_GNU)
 
 /**
- * Flag for [renameat2(2)](http://man7.org/linux/man-pages/man2/renameat2.2.html)
+ * Flag for [renameat2(2)](https://man7.org/linux/man-pages/man2/renameat2.2.html)
  * to fail if the new path already exists.
  */
 #define RENAME_NOREPLACE (1<<0)
 
 /**
- * Flag for [renameat2(2)](http://man7.org/linux/man-pages/man2/renameat2.2.html)
+ * Flag for [renameat2(2)](https://man7.org/linux/man-pages/man2/renameat2.2.html)
  * to atomically exchange the two paths.
  */
 #define RENAME_EXCHANGE (1<<1)
 
 /**
- * Flag for [renameat2(2)](http://man7.org/linux/man-pages/man2/renameat2.2.html)
+ * Flag for [renameat2(2)](https://man7.org/linux/man-pages/man2/renameat2.2.html)
  * to create a union/overlay filesystem object.
  */
 #define RENAME_WHITEOUT (1<<2)
 
 /**
- * [renameat2(2)](http://man7.org/linux/man-pages/man2/renameat2.2.html) changes
+ * [renameat2(2)](https://man7.org/linux/man-pages/man2/renameat2.2.html) changes
  * the name or location of a file, interpreting relative paths using an fd,
  * with optional `RENAME_` flags.
  *