SIGILL: Illegal operation on update
on one of my systems I got this strange issue with choosenim: each operation gives SIGILL.

```
$ choosenim --version
choosenim v0.7.5 (2021-01-02 22:19:38) [linux/amd64]

$ choosenim --debug update stable
      Info: No client ID found in '/home/andrea/.choosenim/analytics', not sending analytics.
      Info: No client ID found in '/home/andrea/.choosenim/analytics', not sending analytics.
   Updating stable
       Http Requesting http://nim-lang.org/channels/stable
SIGILL: Illegal operation.
```

same with a fresh download from the website : 
```
$ curl https://nim-lang.org/choosenim/init.sh -sSf | sh
choosenim-init: Downloading choosenim-0.7.4_linux_amd64
SIGILL: Illegal operation.

```
with advice from dom96 on Discord, I tried an older version and that works.
```
$ ./choosenim-0.5.0_linux_amd64 update stable
   Updating stable
Downloading Nim 1.4.8 from nim-lang.org
[##################################################] 100.0% 0kb/s
 Extracting nim-1.4.8-linux_x64.tar.xz
   Building Nim 1.4.8
 Compiler:  Already built
    Tools:  Already built
    Updated to 1.4.8
```

the problematic system is a standard Debian 10:

```
$ uname -a
Linux hpmicro 4.19.0-16-amd64 #1 SMP Debian 4.19.181-1 (2021-03-19) x86_64 GNU/Linux

$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:        10
Codename:       buster
```

ping me if you need further details
