Arch Linux

Please remove this strings from build script. This is an unnecessary action. You added 'jemalloc' as depend and not makedepend.
In this case it's pointless! Cmake try detect system jemalloc and use it if found and build or use .a file only if system jemalloc not found.


```
# cp libjemalloc from jemalloc package
mkdir -p external/jemalloc/jemalloc-prefix/src/jemalloc/lib/
cp /usr/lib/libjemalloc_pic.a external/jemalloc/jemalloc-prefix/src/jemalloc/lib/libjemalloc.a
```

See telegram jemalloc cmake file. `NOT JEMALLOC_FOUND`
https://github.com/desktop-app/cmake_helpers/blob/a79798285dfc49f63022d4f3aaa1a0da7b49bafa/external/jemalloc/CMakeLists.txt

Telegram already use system jemalloc.
```
lsof /usr/lib/libjemalloc.so
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
telegram- 17939 xxx mem REG 259,7 457024 809175732 /usr/lib/libjemalloc.so.2
telegram- 17958 xxx mem REG 259,7 457024 809175732 /usr/lib/libjemalloc.so.2
telegram- 17960 xxx mem REG 259,7 457024 809175732 /usr/lib/libjemalloc.so.2
```