fix: adjust content ownership in SIMD GLIBC tunable test

Use `content.clone()` for the first two `pipe_in` calls to avoid moving the string, and `content` directly for the third to consume it, ensuring proper Rust ownership handling in the test. This prevents borrow checker errors and allows the test to compile correctly.

Author: mattsu2020

tests/by-util/test_wc.rs

@@ -835,7 +835,7 @@ fn test_simd_respects_glibc_tunables() {
 
         let base = new_ucmd!()
             .arg("-l")
-            .pipe_in(&content)
+            .pipe_in(content.clone())
             .succeeds()
             .stdout_str()
             .trim()
@@ -844,7 +844,7 @@ fn test_simd_respects_glibc_tunables() {
         let no_avx512 = new_ucmd!()
             .arg("-l")
             .env("GLIBC_TUNABLES", "glibc.cpu.hwcaps=-AVX512F")
-            .pipe_in(&content)
+            .pipe_in(content.clone())
             .succeeds()
             .stdout_str()
             .trim()
@@ -853,7 +853,7 @@ fn test_simd_respects_glibc_tunables() {
         let no_avx2_avx512 = new_ucmd!()
             .arg("-l")
             .env("GLIBC_TUNABLES", "glibc.cpu.hwcaps=-AVX2,-AVX512F")
-            .pipe_in(&content)
+            .pipe_in(content)
             .succeeds()
             .stdout_str()
             .trim()