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/setjmp.h b/libc/include/setjmp.h
index 0aaaac5..6c141cb 100644
--- a/libc/include/setjmp.h
+++ b/libc/include/setjmp.h
@@ -111,7 +111,7 @@
 __noreturn void longjmp(jmp_buf __env, int __value);
 
 /**
- * [sigsetjmp(3)](http://man7.org/linux/man-pages/man3/sigsetjmp.3.html)
+ * [sigsetjmp(3)](https://man7.org/linux/man-pages/man3/sigsetjmp.3.html)
  * sets the target of a future siglongjmp() call, saving or not saving the
  * current signal mask based on the second argument.
  *
@@ -121,7 +121,7 @@
 int sigsetjmp(sigjmp_buf __env, int __save_signal_mask) __returns_twice;
 
 /**
- * [siglongjmp(3)](http://man7.org/linux/man-pages/man3/siglongjmp.3.html)
+ * [siglongjmp(3)](https://man7.org/linux/man-pages/man3/siglongjmp.3.html)
  * transfers control back to the site of the sigsetjmp() call that initialized
  * the given jump buffer, returning the given value.
  *