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/android/dlext.h b/libc/include/android/dlext.h
index b42e5b2..842ceea 100644
--- a/libc/include/android/dlext.h
+++ b/libc/include/android/dlext.h
@@ -30,7 +30,7 @@
 /**
  * \file
  * Advanced dynamic library opening support. Most users will want to use
- * the standard [dlopen(3)](http://man7.org/linux/man-pages/man3/dlopen.3.html)
+ * the standard [dlopen(3)](https://man7.org/linux/man-pages/man3/dlopen.3.html)
  * functionality in `<dlfcn.h>` instead.
  */
 
@@ -174,7 +174,7 @@
 
 /**
  * Opens the given library. The `__filename` and `__flags` arguments are
- * the same as for [dlopen(3)](http://man7.org/linux/man-pages/man3/dlopen.3.html),
+ * the same as for [dlopen(3)](https://man7.org/linux/man-pages/man3/dlopen.3.html),
  * with the Android-specific flags supplied via the `flags` member of `__info`.
  */
 void* _Nullable android_dlopen_ext(const char* _Nullable __filename, int __flags, const android_dlextinfo* _Nullable __info);