fs: Run file lock tests on all platforms that support it

[tgross35]

There are a number of platforms that support file locking but aren't getting tested. Synchronize the list and mark the tests should_panic otherwise, to make sure they get updated if more platforms add locking support.

The supported platform list comes from

rust/library/std/src/sys/fs/unix.rs

Lines 1291 to 1308 in 07bdbae

	#[cfg(any(
	target_os = "freebsd",
	target_os = "fuchsia",
	target_os = "linux",
	target_os = "netbsd",
	target_os = "openbsd",
	target_os = "cygwin",
	target_os = "illumos",
	target_os = "aix",
	target_vendor = "apple",
	))]
	pub fn lock(&self) -> io::Result<()> {
	cvt(unsafe { libc::flock(self.as_raw_fd(), libc::LOCK_EX) })?;
	return Ok(());
	}
	#[cfg(target_os = "solaris")]
	pub fn lock(&self) -> io::Result<()> {

. Windows also supports file locks, all other platforms are unsupported.

[rustbot]

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[tgross35]

Sorry bors3

@bors2 try jobs=arm-android,test-various

[rust-bors]

💔 Test for 534bfac failed: CI. Failed jobs:

• try - arm-android (web logs, extended logs)

[tgross35]

@bors2 try jobs=arm-android,test-various

[rust-bors]

☀️ Try build successful (CI)
Build commit: eb7fa5a (eb7fa5adff9becc0b258d7730b9afab7defca4d6, parent: 07bdbaedc63094281483c40a88a1a8f2f8ffadc5)

[mati865]

FYI, you no longer need to call bors2 because bors try already uses the new one: https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/Testing.20try.20builds.20with.20new.20bors/near/530101996