As per man page eval(1p):
> The eval utility shall construct a command by concatenating arguments together,
> separating each with a `<space>` character. The constructed command shall be
> read and executed by the shell.
When not quoting `$kak_opt_makecmd` in the eval, the variable is split by
newlines and spaces and then joined by spaces to form the command. If there
were newlines in `$kak_opt_makecmd`, the command would be malformed.
To reproduce:
```kak
set-option global makecmd "
echo foo
echo bar"
make a b c
```
Expected output in the `*make*` buffer:
```
foo
bar a b c
```
Actual output:
```
foo echo bar a b c
```
This patch fixes this.
