[llvm-objcopy] Temporarily limit one test to darwin

Some triples in llvm-mc appear to be unavailable on some buildbots.
To please those buildbots we temporarily limit the test to darwin 
(where the required triple is guranteed to be available)
until we find the right solution.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@352950 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/tools/llvm-objcopy/MachO/real-world-input-copy.test b/test/tools/llvm-objcopy/MachO/real-world-input-copy.test
index 47a389e..d29c2cc 100644
--- a/test/tools/llvm-objcopy/MachO/real-world-input-copy.test
+++ b/test/tools/llvm-objcopy/MachO/real-world-input-copy.test
@@ -1,3 +1,4 @@
+REQUIRES: system-darwin
 # RUN: llvm-mc -assemble -triple i386-apple-darwin9 -filetype=obj %p/Inputs/macho.32.s -o %t.32.o
 # RUN: llvm-objcopy %t.32.o %t.32.copy.o
 # RUN: cmp %t.32.o %t.32.copy.o