fix line length

Author: chandde

src/libtest/lib.rs

@@ -37,9 +37,10 @@ extern crate libc;
 use term;
 
 // FIXME(#54291): rustc and/or LLVM don't yet support building with panic-unwind
-//                on aarch64-pc-windows-msvc, or thumbv7a-pc-windows-msvc, so we don't link libtest against
-//                libunwind (for the time being), even though it means that
-//                libtest won't be fully functional on these platforms.
+//                on aarch64-pc-windows-msvc, or thumbv7a-pc-windows-msvc
+//                so we don't link libtest against libunwind (for the time being)
+//                even though it means that libtest won't be fully functional on
+//                these platforms.
 //
 // See also: https://github.com/rust-lang/rust/issues/54190#issuecomment-422904437
 #[cfg(not(all(windows, any(target_arch = "aarch64", target_arch = "arm"))))]