Upgrade liberasurecode 1.5.0 -> 1.6.1

[koba-e964]

Resolves #13.

Probably this PR needs to wait until #12 is merged.

[koba-e964]

Build cache images are too old. I'll delete them and re-run.

[yoffy]

note:
crc32 が zlib のものに変更されており、内部的には互換性が無くなっている。
検査に失敗したら古い crc32 を呼ぶようになっており、外見上は互換性を維持している。
https://github.com/openstack/liberasurecode/compare/1.5.0..1.6.1#diff-0124ae530ee97ecd71667291b748a527R1089

こちらも参照
https://bugs.launchpad.net/liberasurecode/+bug/1666320

[yoffy]

LGTM

[koba-e964]

Note: we need to check if frugalos built with this change works correctly.

[koba-e964]

On MacOS High Sierra (10.13.6):

$ otool -L target/debug/frugalos
target/debug/frugalos:
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.50.4)
        /System/Library/Frameworks/Security.framework/Versions/A/Security (compatibility version 1.0.0, current version 58286.70.14)
        /usr/lib/libresolv.9.dylib (compatibility version 1.0.0, current version 1.0.0)
$ rustc --version
rustc 1.35.0 (3c235d560 2019-05-20)
$ cargo --version
cargo 1.35.0 (6f3e9c367 2019-04-04)

On Linux (CentOS 7):

[vagrant@localhost frugalos]$ ldd target/release/frugalos
	linux-vdso.so.1 =>  (0x00007ffeb7df1000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fc6c21bc000)
	libdl.so.2 => /lib64/libdl.so.2 (0x00007fc6c1fb8000)
	librt.so.1 => /lib64/librt.so.1 (0x00007fc6c1db0000)
	libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fc6c1b9a000)
	libc.so.6 => /lib64/libc.so.6 (0x00007fc6c17cd000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fc6c3972000)
	libm.so.6 => /lib64/libm.so.6 (0x00007fc6c14cb000)
[vagrant@localhost frugalos]$ rustc --version
rustc 1.35.0 (3c235d560 2019-05-20)
[vagrant@localhost frugalos]$ cargo --version
cargo 1.35.0 (6f3e9c367 2019-04-04)

Seems ok 😁

[koba-e964]

Note: fragments made in the old version and in the new version differ, because crc32's implementation changed.
However, fragments made in the old version can still be readable from the new version, because openstack/liberasurecode handles this issue.