Changes needed to run on OSS-Fuzz.

Bump libunwindstack to build with system libc++.

Bug: 69150303
Change-Id: I6a4fae6bb201f0e2164a6d04ad116f1b61e3bf0f
diff --git a/BUILD.gn b/BUILD.gn
index 773c50b..6e4bab5 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -75,7 +75,7 @@
       if (is_linux) {
         deps += [ "tools:pipestats" ]
       }
-      if (use_libfuzzer) {
+      if (is_fuzzer) {
         deps += [ ":fuzzers" ]
       }
     }