Takuya ASADA

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@avikivity Merged two package into one, now unified package has stripped binary + debug symbol, install stripped binary by default, and added an option to install debug symbol (`./install.sh --debuginfo`).

Note: we had discussion to add support stripped binary in relocatable package to use it for Docker image, but I think we should have it whether we use it for...

> @syuu1228 I meant I hadn't considered two packages, and that we can consider it, not that one package is inherently better. But at least it's simpler, so let's start...

@avikivity Pushed new version that directly generates debuginfo and stripped binary.

@avikivity Added `-e`, `-o pipefail` and `--threads 0` for xz.

Also added `-f` for xz to prevent file already exists error when re-running the build

@avikivity Rebased, and tested gdb able to resolve debug symbols with rpm/deb debug package.