fix: bump version of libbacktrace library

Old version doesn't support debug information for ELF produced by modern compilers

It appears like an error:
 > unrecognized DWARF version in .debug_info at 6
 > no debug info in ELF executable

which causes:
 > No debug information available for stacktrace. You should add debug information and then run

And backtraces are not shown on linux even if debug infos here.

With this fixes output as expected:
```
std::terminate() called due to unhandled exception
Exception: type=char const*, what="HEHE"
   0#: (0x5D7C19364C3F) bitcoind.cpp:114          - AppInit
   1#: (0x5D7C19364C3F) bitcoind.cpp:273          - main
   2#: (0x7B0B19C28150) libc_start_call_main.h:74 - __libc_start_call_main
   3#: (0x7B0B19C28209) libc-start.c:128          - call_init
   4#: (0x7B0B19C28209) libc-start.c:347          - __libc_start_main_impl
   5#: (0x5D7C193734D5) <unknown-file>            - ???
```

Author: knst

depends/packages/backtrace.mk

@@ -1,8 +1,9 @@
 package=backtrace
-$(package)_version=rust-snapshot-2018-05-22
-$(package)_download_path=https://github.com/rust-lang-nursery/libbacktrace/archive
-$(package)_file_name=$($(package)_version).tar.gz
-$(package)_sha256_hash=8da6daa0a582c9bbd1f2933501168b4c43664700f604f43e922e85b99e5049bc
+$(package)_version=11427f31a64b11583fec94b4c2a265c7dafb1ab3
+$(package)_download_path=https://github.com/ianlancetaylor/libbacktrace/archive
+$(package)_download_file=$($(package)_version).tar.gz
+$(package)_file_name=$(package)_$($(package)_version).tar.gz
+$(package)_sha256_hash=76a8348ff04d80141aeb1c0e55879f17f241f38238def0eb1df7c6d1ac1a2c26
 
 define $(package)_set_vars
 $(package)_config_opts=--disable-shared --enable-host-shared --prefix=$(host_prefix)