feat: Support `fstat` in linux #12398

Job	Run time
style checks	5m 11s
bootstrap build	2m 55s
test (x86_64-unknown-linux-gnu)	22m 15s
test (i686-unknown-linux-gnu)	19m 21s
coverage report	6m 1s
test (aarch64-unknown-linux-gnu)	19m 5s
test (aarch64-apple-darwin)	20m 53s
test (armv7-unknown-linux-gnueabihf)	17m 35s
test (i686-pc-windows-msvc)	23m 13s
test (aarch64-pc-windows-msvc)	20m 11s
automatic pull from rustc	0s
conclusion	4s
cronjob failure notification	0s
	2h 36m 44s

Provide feedback