pkg/vcs: reset state even more
pkg/vcs: reset state even more

"git clean -fd" does not remove ignored files,
while can mess state when .gitignore changes across commits.
Use "git clean -fdx" to delete ignored files as well.

xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller