Closed issue by yopito on void-packages repository

https://github.com/void-linux/void-packages/issues/12807

Description:
### System

* xuname:  `Void 4.19.56_1 x86_64 GenuineIntel notuptodate rFF`
  *output of ``xuname`` (part of xtools)*
* package:  `wxWidgets-gtk3-devel-3.0.4_1`
  *affected package(s) including the version*

### Expected behavior

building and cross-building using `wx-config-gtk3` should be fine, whatever the target architecture is.

### Actual behavior

Cross-building using `wx-config-gtk3` for i686 target arch fails.

### Steps to reproduce the behavior

Crossbuild filezilla for i686 for instance:
```
[...]
checking pkg-config is at least version 0.9.0... yes
checking for libfilezilla >= 0.17.1... yes
checking for wx-config-gtk3... /usr/bin/wx-config-gtk3
checking for wxWidgets version >= 3.0.4 (--unicode=yes --universal=no)... no
configure: error: 
    The requested wxWidgets build couldn't be found.
[...]
```

### Additional infos

`wx-config-gtk3` is a symlink , that is not consistent in packages: sometime absolute, sometime relative.  
So `generic_wrapper` don't wrap it for i686, that make build fails then.

Example on some package(s):

```
$ for i in repocache/wxWidgets-gtk3-devel-3.0.4_1.*.xbps; 
     do echo ; echo "# $i" ; tar tvJf $i | grep wx-config
done

# repocache/wxWidgets-gtk3-devel-3.0.4_1.aarch64-musl.xbps
lrwxrwxrwx 0/0               0 2018-09-10 14:43 ./usr/bin/wx-config-gtk3 -> ../lib/wx/config/gtk3-unicode-3.0

# repocache/wxWidgets-gtk3-devel-3.0.4_1.aarch64.xbps
lrwxrwxrwx 0/0               0 2018-09-10 14:43 ./usr/bin/wx-config-gtk3 -> ../lib/wx/config/gtk3-unicode-3.0

# repocache/wxWidgets-gtk3-devel-3.0.4_1.i686.xbps
lrwxrwxrwx 0/0               0 2018-09-10 14:43 ./usr/bin/wx-config-gtk3 -> /usr/lib32/wx/config/gtk3-unicode-3.0

# repocache/wxWidgets-gtk3-devel-3.0.4_1.x86_64.xbps
lrwxrwxrwx 0/0               0 2018-09-10 14:43 ./usr/bin/wx-config-gtk3 -> /usr/lib/wx/config/gtk3-unicode-3.0
```
Edit: not strictly related to fails build of PR #11854, add output for filezilla/i686