New comment by CMB on void-packages repository

https://github.com/void-linux/void-packages/pull/27708#issuecomment-755073465

Comment:
> I didn't find strtod in the configure output, maybe only strstr and strtoul
> are required?

I did a quick comparison of tcl8.6.10 source with an older
version I happened to have lying around in distfiles.  The strtod test
was removed at some point.

I'll remove this since it isn't needed anymore.