cmd: remove hpkg

This proof-of-concept was abandoned long ago. Its test suite is flaky, heavy on I/O and does not increase test coverage. This change fully removes hpkg and supporting code.

Signed-off-by: Ophestra <cat@gensokyo.uk>

dist/release.sh

@@ -13,7 +13,7 @@ echo
 echo '# Building hakurei.'
 go generate ./...
 go build -trimpath -v -o "${out}/bin/" -ldflags "-s -w
-  -buildid= -extldflags '-static'
+  -buildid= -linkmode external -extldflags=-static
   -X hakurei.app/internal/info.buildVersion=${VERSION}
   -X hakurei.app/internal/info.hakureiPath=/usr/bin/hakurei
   -X hakurei.app/internal/info.hsuPath=/usr/bin/hsu
@@ -21,7 +21,7 @@ go build -trimpath -v -o "${out}/bin/" -ldflags "-s -w
 echo
 
 echo '# Testing hakurei.'
-go test -ldflags='-buildid= -extldflags=-static' ./...
+go test -ldflags='-buildid= -linkmode external -extldflags=-static' ./...
 echo
 
 echo '# Creating distribution.'