The "build info" string included in libcoreclr.so contains invalid data

[mellinoe]

We embed some build information in libcoreclr.so (and other binaries, I think), including the version, the commit hash, and the name of the build machine (presumably). It looks like at least some of our build machines are not able to run the hostname command, which leads to this incorrect output:

strings libcoreclr.so | grep "@(#)"
@(#)Version 4.6.25206.02 built by: root-/tmp/tmp5dc91113a4d04cb8b90399c24cabee67.exec.cmd: line 2: hostname: command not found. Commit Hash: f9d0333d8955c11a2e8f495f0a12d6384fb95541

root-/tmp/tmp5dc91113a4d04cb8b90399c24cabee67.exec.cmd: line 2: hostname: command not found.

The important information (commit hash) seems to be fine, at least.

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