[lld-macho] rm old test directory for segments.s

This should unbreak incremental builds after https://github.com/llvm/llvm-project/commit/8ca366935b055283b571ba0893f53a7a18ac59bb

GitOrigin-RevId: 84cf9a7a4af6f74909216259681d301b7641635c
diff --git a/test/MachO/segments.s b/test/MachO/segments.s
index f4ac4c8..5fdbfe7 100644
--- a/test/MachO/segments.s
+++ b/test/MachO/segments.s
@@ -1,4 +1,5 @@
 # REQUIRES: x86
+# RUN: rm -rf %t
 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %s -o %t.o
 # RUN: %lld -o %t %t.o
 # RUN: llvm-readobj --macho-segment %t > %t.out