math/gotoblas: Remove obsoleted port

math/gotoblas is broken on multiple platforms and is very outdated. By
Wikipedia, "GotoBLAS remains available, but development ceased with a
final version touting optimal performance on Intel's Nehalem
architecture (contemporary in 2008). OpenBLAS is an actively maintained
fork of GotoBLAS".

PR: 261194
Reported by: Daniel Tameling <tamelingdaniel@gmail.com>