RFR: 1390: Do not automatically assign the 'build' label to pull requests for IdealGraphVisualizer and LogCompilation

[Roberto Castañeda Lozano]

This change removes the mapping of `src/utils/IdealGraphVisualizer` and `src/utils/LogCompilation` to the `build` label to avoid sending irrelevant review emails to the `build-dev` mailing list. These tools are maintained by HotSpot compiler developers and already mapped to the `hotspot-compiler` label.

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Commit messages:
 - Map only the 'hsdis' and 'src' subdirectories of 'src/utils/' to 'build'

Changes: https://git.openjdk.java.net/skara/pull/1296/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1296&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1390
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/1296.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1296/head:pull/1296

PR: https://git.openjdk.java.net/skara/pull/1296