Merge changes from the Perl side

This contains many changes from https://80x24.org/mwrap-perl.git
commit

* Built-in RCU-friendly version of dlmalloc, no more fragile dlsym(3m)
  resolution of malloc-family functions in the constructor

* Allocations are now backed by O_TMPFILE on $TMPDIR on modern Linux.
  Since mwrap increases memory usage greatly and I needed to use it
  on a system where I needed more VM space but lacked the ability
  to add swap.

* Configurable C backtrace level via MWRAP=bt:$DEPTH where $DEPTH
  is a non-negative integer.  Be careful about increasing it, even
  a depth of 3-4 can be orders-of-magnitude more expensive in
  time and space.  This can be changed dynamically at runtime via
  local HTTP (see below).

* Embedded per-process local-socket-only HTTP server obsoletes
  MwrapRack when combined with mwrap-rproxy from the Perl dist
  (set `MWRAP=socket_dir:/dir/of/sockets')
  See https://80x24.org/mwrap-perl/20221210015518.272576-4-e@80x24.org/
  for more info.

  It now supports downloading CSV (suitable for importing into sqlite 3.32.0+)

* License switched to GPL-3+ to be compatible with GNU binutils
  since we may take code from addr2line in the future.

* libxxhash supported if XXH3_64bits is available.

1 files changed, 13 insertions, 0 deletions

diff --git a/ext/mwrap/gcc.h b/ext/mwrap/gcc.h
new file mode 100644
index 0000000..2312aa9
--- /dev/null
+++ b/ext/mwrap/gcc.h
@@ -0,0 +1,13 @@
+/* CC0 (Public domain) - http://creativecommons.org/publicdomain/zero/1.0/ */
+#ifndef GCC_H
+#define GCC_H
+#define ATTR_COLD        __attribute__((cold))
+
+#if __STDC_VERSION__ >= 201112
+#        define MWRAP_TSD _Thread_local
+#elif defined(__GNUC__)
+#        define MWRAP_TSD __thread
+#else
+#        error _Thread_local nor __thread supported
+#endif
+#endif /* GCC_H */