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Expose _Unwind_Backtrace in libcxxrt

--- boost/stacktrace/detail/collect_unwind.ipp.orig	2019-02-21 20:58:43 UTC
+++ boost/stacktrace/detail/collect_unwind.ipp
@@ -25,7 +25,18 @@
 #include <execinfo.h>
 #include <algorithm>
 #else
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#define _GNU_SOURCE_TEMPORARY
+#endif
 #include <unwind.h>
+#ifdef _GNU_SOURCE_TEMPORARY
+#undef _GNU_SOURCE
+#undef _GNU_SOURCE_TEMPORARY
+#endif
+#if !defined(_URC_NO_REASON) && defined(__arm__) && !defined(__ARM_DWARF_EH__)
+#define _URC_NO_REASON _URC_OK
+#endif
 #endif
 #include <cstdio>