Continued: Declarations of the same C struct conflict when imported

[György Andrasek]

Hi,

I accidentally ran dstep twice and ended up with the following 
interaction:

https://github.com/ldc-developers/ldc/issues/3155

---

ldc 1.17.0, Android/Termux.

libarchive comes in two public header files: `archive.h` and 
`archive_entry.h`.

Both headers declare `struct archive;` and `struct 
archive_entry;`, faithfully
reproduced by dstep. Trying to import both yields a conflict 
immediately:

```
[  6%] Building D object 
CMakeFiles/wng.dir/src/wngbase/libarchive.o
/data/data/com.termux/files/home/weidu-ng/src/wngbase/libarchive.d(27): Error: `archive_h.archive` at /data/data/com.termux/files/home/weidu-ng/src/wngbase/binding/archive_h.d(122) conflicts with `archive_entry_h.archive` at /data/data/com.termux/files/home/weidu-ng/src/wngbase/binding/archive_entry_h.d(92)
/data/data/com.termux/files/home/weidu-ng/src/wngbase/libarchive.d(28): Error: `archive_h.archive_entry` at /data/data/com.termux/files/home/weidu-ng/src/wngbase/binding/archive_h.d(123) conflicts with `archive_entry_h.archive_entry` at /data/data/com.termux/files/home/weidu-ng/src/wngbase/binding/archive_entry_h.d(93)
```

Annoying, but alias can deal with it. The problem comes in 
actually using them. Annotated for clarity:

```D
int archive_read_next_header(archive_h.archive*, 
archive_h.archive_entry**);

const(char)* 
archive_entry_pathname_utf8(archive_entry_h.archive_entry*);
```

(I'm guessing this is the correct place to report this since this 
is a notable improvement from ldc 1.13, which didn't even 
understand pointer-to-opaque.)

---

They told me to go away. :)

I'm not trying to redesign the language, it simply didn't occur 
to me that this won't work or isn't a trivial oversight. (Android 
is dark and full of terrors.)

I can't imagine how it makes the language better to disallow 
cross-module C calls like this, given that the least ugly 
workaround is `void *`.

P.S. @kinke went through the trouble of upgrading ldc on Termux 
while I was busy installing cargo. Android is now ahead of 
Ubuntu. Please give him a medal or something.