roms/seabios-hppa: Use consistent date and remove hostname.

Two issues break reproducibility; the time and hostname get embedded
in the resulting seabios binary.

Simply drop the hostname from the embedded version string, as it
shouldn't be needed in Debian package builds.

Use the SOURCE_DATE_EPOCH environment variable to set the build date
rather than the current time:

  https://reproducible-builds.org/docs/source-date-epoch/

Gbp-Pq: Name seabios-hppa-use-consistent-date-and-remove-hostname.patch
Signed-off-by: Cong Liu <liucong2@kylinos.cn>

roms/seabios-hppa/scripts/buildversion.py

@@ -125,9 +125,8 @@ def main():
         if not ver:
             ver = "?"
     if not cleanbuild:
-        btime = time.strftime("%Y%m%d_%H%M%S")
-        hostname = socket.gethostname()
-        ver = "%s-%s-%s" % (ver, btime, hostname)
+        btime = time.strftime("%Y%m%d_%H%M%S", time.gmtime(int(os.environ.get('SOURCE_DATE_EPOCH', time.time()))))
+        ver = "%s-%s" % (ver, btime)
     write_version(outfile, ver + options.extra, toolstr)
 
 if __name__ == '__main__':