[Fuzzer] Update the header path for fdio/spawn.h on Fuchsia

The path now includes lib/ prefix.

Differential Revision: https://reviews.llvm.org/D47866

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@334213 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/FuzzerUtilFuchsia.cpp b/FuzzerUtilFuchsia.cpp
index 83e1674..3dacbd0 100644
--- a/FuzzerUtilFuchsia.cpp
+++ b/FuzzerUtilFuchsia.cpp
@@ -18,7 +18,7 @@
 #include <cinttypes>
 #include <cstdint>
 #include <fcntl.h>
-#include <fdio/spawn.h>
+#include <lib/fdio/spawn.h>
 #include <string>
 #include <sys/select.h>
 #include <thread>