[pkg-go] gost is marked for autoremoval from testing

[Debian testing autoremoval watch]

gost 0.1.0+git20181204.5afeda5e-1 is marked for autoremoval from testing on 2020-04-07

It (build-)depends on packages with these RC bugs:
952176: golang-github-facebookgo-ensure: FTBFS: dh_auto_test: error: cd obj-x86_64-linux-gnu && go test -vet=off -v -p 4 github.com/facebookgo/ensure returned exit code 1
952215: golang-github-facebookgo-stack: FTBFS: dh_auto_test: error: cd obj-x86_64-linux-gnu && go test -vet=off -v -p 4 github.com/facebookgo/stack returned exit code 1