remove golang rebuild as it's no longer a package set

sau/gentoo.py

@@ -270,50 +270,6 @@ def pkg_upgrade():
         # from here on we shouldn't need to rebuild the upgraded packages again
         exclude_list = ' --exclude '.join(rebuild_packages.keys()).split()
 
-        # Rebuild go
-        go_packages = []
-        cmd = None
-        for package,eclasses in rebuild_packages.items():
-            if 'go-module' in eclasses or package == 'dev-lang/go':
-                go_packages.append(package)
-        if 'dev-lang/go' in go_packages:
-            log.info("Running golang-rebuild due to update of dev-lang/go")
-            cmd = [
-                    EMERGE_PATH,
-                    '--color', 'n',
-                    '-q',
-                    '--usepkg', 'n',
-                    '@golang-rebuild',
-                    '--exclude' ] + exclude_list
-        elif go_packages:
-            dependencies = []
-            for package in go_packages:
-                dependencies.extend(get_dependencies(package))
-            dependencies = set(dependencies)
-            upgraded = set(rebuild_packages.keys())
-            not_upgraded = dependencies-upgraded
-            if not_upgraded:
-                log.info(f'Rebuilding packages dependant of go modules {", ".join(go_packages)}')
-                cmd = [
-                    EMERGE_PATH,
-                    '--color', 'n',
-                    '-q',
-                    '--usepkg', 'n'] + not_upgraded
-        if cmd:
-            ret, out, err = sau.helpers.exec_cmd(cmd, timeout=72000)
-            if ret != 0 or err:
-                log.error('Rebuild of go packages returned {}'.format(ret))
-                for line in out.splitlines():
-                    log.error('stdout: {}'.format(line))
-                for line in err.splitlines():
-                    log.error('stderr: {}'.format(line))
-                raise sau.errors.UpgradeError(f'Error during go rebuild')
-            else:
-                log.info('go rebuild complete')
-                for line in out.splitlines():
-                    if line.startswith(' * '):
-                        log.warning(line)
-
         # rebuild rust
         if any([x in rebuild_packages for x in ('dev-lang/rust', 'dev-lang/rust-bin')]):
             log.info("Running rust-rebuild due to update of rust")