Update lrzip to 0.621, provided by Thomas Merkel

Changes:
MARCH 2015, version 0.621 Con Kolivas, Peter Hyman

* Fix libzpaq.cpp warnings
* Fix warnings in LzmaLib.c
* Making the high buffer only one page size is faster for sliding mmap mode
* Fix incompatible log callback in liblrzip
* Use PRId64 instead of lld in fscanf
* Use int64_t for i64
* Fix ISO C warning in lrzip.c
* Fix ISO C warning in lrzip.c
* Fix ISO C warning in runzip.c
* Fix ISO C warnings in rzip.c
* Fix iso c warning in util.c
* Fix EOL to unix on libzpaq
* control->tmpdir fixes
* Null terminate long options to find unhandled options
* Trivial date
* Add long option support
* Brace failure lead to broken dump to stdout
* fflush messages on print_err
* Fix inverse logic
* Honour the proper unix environment variable for temporary directory and then
try variations
* Attempt to decompress file in ram only if we are unable to create temporary
files when decompressing to stdout
* Avoid checking return values repeatedly on compress that only lead to failures
anyway
* Microoptimisation
* Don't check for failure condition that can no longer occur
* Don't check twice for failure conditions that are fatal in hot paths
* Cache the chunk bytes value to avoid setting it on each read_header call
* fake_mremap is only used when defined to mremap
* Remove unused cksem functions
* Fix remaining use of mutexes lock/unlocking in different threads with cksems,
corecting cksem usage on osx
* Update copyright dates
* Make match_len a function completely removing all indirect calls to get_sb,
significantly speeding up the single_get_sb case
* Make full_tag a pointer allowing us to avoid a function call for get_sb
* Call sliding_get_sb directly in sliding_next_tag
* Make next_tag a pointer to allow ordinary mapping to avoid an extra function
call
* fix order of lrzip.conf search

MARCH 2015, version 0.620 Con Kolivas, Peter Hyman, Chris Spiegel, Elmir Jagudin

* Increase maxram when we abandon use of temporary input/output buffers
* Don't delete the tmpinfile when decompressing from stdin before allowing seek
to end to succeed in checking md5
* Use temporary file from read_seekto when STDIN will not fit in the ram input
buffer
* Remove unused read_i64 function
* Add message about issue tracker in BUGS
* Use a common exit path iin lrzip_compress/decompress and fix lr leak on
successful return
* Fix parenthesis placement inside of unlikely().
* Clear sa_mask and sa_handler before calling sigaction().
* Fix for lrzip -i. Decompressed size wrong
* added '-m' command line option
* Fix wrong README file being included in Makefile
* Pass strict sizes to decompress length, rounding up only the amount we're
allocating to not confuse decompression libraries
* Convert the thread locking to use cksems
* Add cksems to util.h
* Fix 'Failed to malloc ckbuf in hash_search2' with very large files.
* Round up compression and decompression buffers to page size since malloc will
allocate them that large anyway.
* Increase the compressed buffer size given to libzpaq in case of incompressible
data since it does not check if it's trying to write beyond the end of the
buffer.
* Provide a helper function to round a value up to the nearest page size for
malloc optimisations.

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