Add libunwind to the release scripts

llvm-svn: 242543
diff --git a/llvm/utils/release/export.sh b/llvm/utils/release/export.sh
index 9aee306..2fd4206 100755
--- a/llvm/utils/release/export.sh
+++ b/llvm/utils/release/export.sh
@@ -14,7 +14,7 @@
 
 set -e
 
-projects="llvm cfe test-suite compiler-rt libcxx libcxxabi clang-tools-extra polly lldb lld openmp"
+projects="llvm cfe test-suite compiler-rt libcxx libcxxabi clang-tools-extra polly lldb lld openmp libunwind"
 base_url="https://llvm.org/svn/llvm-project"
 
 release=""