cmd/cgo: don't force rewritten code onto a single line
Doing that appears to have been a mistake in CL 142883.
Fixes #67517
Change-Id: Iec6b897984a2e27ec596fc3c4c8129e9620afab1
Reviewed-on: https://go-review.googlesource.com/c/go/+/586676
Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
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