libsanitizer: Fix up libbacktrace build after r13-4547 [PR108072]

The r13-4547 commit added new non-static function to libbacktrace:
backtrace_uncompress_zstd but for the libsanitizer use we need to
rename it, so that it is in __asan_* namespace and doesn't clash
with other copies of libbacktrace.

2022-12-13  Jakub Jelinek  <jakub@redhat.com>

libsanitizer/
	PR sanitizer/108072
	* libbacktrace/backtrace-rename.h (backtrace_uncompress_zstd): Define.