Auto merge of #35426 - frewsxcv:os-sys-env-args-phantoms, r=alexcrichton
Auto merge of #35426 - frewsxcv:os-sys-env-args-phantoms, r=alexcrichton

Utilize `PhantomData` to enforce `!Sync` and `!Send` field.

None

graydon/rust,GBGamer/rust,GBGamer/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,GBGamer/rust,aidancully/rust,aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,graydon/rust