archive/tar: extend TestFileInfoHeaderSymlink
archive/tar: extend TestFileInfoHeaderSymlink

For #17541.

Change-Id: I524ab194f32b8b061ce1c9c3e0cd34cc5539358e
Reviewed-on: https://go-review.googlesource.com/39410
Run-TryBot: Alex Brainman <54ba58c8441b5eff861de6b4e5ee46baf086b142@gmail.com>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

polyverse-security/go,Cofyc/go,golang/go,codestation/go,josharian/go,codestation/go,ImJasonH/go,vsekhar/elastic-go,codestation/go,golang/go,josharian/go,CAFxX/go,ImJasonH/go,nawawi/go,vsekhar/elastic-go,cloudflare/go,christopher-henderson/Go,polyverse-security/go,golang/go,akutz/go,derekmarcotte/go,CAFxX/go,vsekhar/elastic-go,josharian/go,cloudflare/go,derekmarcotte/go,derekmarcotte/go,ImJasonH/go,vsekhar/elastic-go,Cofyc/go,Cofyc/go,polyverse-security/go,josharian/go,polyverse-security/go,vsekhar/elastic-go,akutz/go,ImJasonH/go,josharian/go,golang/go,polyverse-security/go,ImJasonH/go,CAFxX/go,Cofyc/go,CAFxX/go,derekmarcotte/go,codestation/go,derekmarcotte/go,CAFxX/go,golang/go,derekmarcotte/go,codestation/go,akutz/go,josharian/go,vsekhar/elastic-go,nawawi/go,codestation/go,Cofyc/go,akutz/go,vsekhar/elastic-go,CAFxX/go,ImJasonH/go,CAFxX/go,nawawi/go,polyverse-security/go,nawawi/go,cloudflare/go,cloudflare/go,akutz/go,akutz/go,derekmarcotte/go,josharian/go,josharian/go,golang/go,akutz/go,nawawi/go,Cofyc/go,cloudflare/go,nawawi/go,CAFxX/go,polyverse-security/go,ImJasonH/go,vsekhar/elastic-go,cloudflare/go,Cofyc/go,nawawi/go,cloudflare/go,codestation/go,derekmarcotte/go,golang/go,ImJasonH/go,akutz/go,cloudflare/go,codestation/go,nawawi/go,polyverse-security/go,golang/go,Cofyc/go