New comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/24298#issuecomment-675711533

Comment:
I think this is more consistent even if official Void kernels don't ship with anything more than a single hyphen. Let's say a local package (or unpackaged kernel build) modifies LOCALVERSION to be `-test_${revision}`. We have two kernels:
```
/boot/vmlinuz-5.7.14_1
/boot/vmlinuz-5.7.14-test_1
```
Running `vkpurge list` before this patch is applied, if you are on `5.7.14_1`, will show
```
test_1
```
and attempting to `vkpurge rm all` will look for `/boot/vmlinuz-test_1`, which is clearly not correct.

After the patch, `vkpurge list` will show
```
5.7.14-test_1
```
and `vkpurge rm all` will look for and successfully delete `/boot/vmlinuz-5.7.14-test_1`.