Unbreak non-unix non-windows bootstrap

[dtolnay]

Fixes #118862.

#118647 added a new use of std::io::Write that is not conditional on any cfg.

rust/src/bootstrap/src/bin/main.rs

Line 134 in 028b6d1

t!(file.write_all(lines.join("\n").as_bytes()));

error[E0599]: no method named `write_all` found for struct `File` in the current scope
   --> src/bin/main.rs:134:21
    |
134 |             t!(file.write_all(lines.join("\n").as_bytes()));
    |                     ^^^^^^^^^ method not found in `File`
    |
    = help: items from traits can only be used if the trait is in scope
help: the following trait is implemented but not in scope; perhaps add a `use` for it:
    |
8   + use std::io::Write;
    |

[rustbot]

r? @onur-ozkan

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[onur-ozkan]

@bors r+

[bors]

📌 Commit b30e94b has been approved by onur-ozkan

It is now in the queue for this repository.

[bors]

⌛ Testing commit b30e94b with merge 7176b8b...

[bors]

☀️ Test successful - checks-actions
Approved by: onur-ozkan
Pushing 7176b8b to master...

[rust-timer]

Finished benchmarking commit (7176b8b): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -perf-regression

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-10.4%	[-30.8%, -0.6%]	8
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-10.4%	[-30.8%, -0.6%]	8

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	1.0%	[1.0%, 1.0%]	1
Improvements ✅ (primary)	-3.5%	[-5.9%, -1.4%]	4
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-3.5%	[-5.9%, -1.4%]	4

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-12.3%	[-28.0%, -1.1%]	6
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-12.3%	[-28.0%, -1.1%]	6

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 672.982s -> 673.56s (0.09%)
Artifact size: 312.42 MiB -> 312.39 MiB (-0.01%)