Fix a broken buildbot.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@343983 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/ELF/strip-debug.s b/test/ELF/strip-debug.s
index f33f1ca..e5295f1 100644
--- a/test/ELF/strip-debug.s
+++ b/test/ELF/strip-debug.s
@@ -1,4 +1,4 @@
-# REQUIRES: x86
+# REQUIRES: x86, zlib
 # RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
 # RUN: ld.lld %t -o %t2 --strip-debug
 # RUN: llvm-readobj -sections %t2 | FileCheck %s