[cr] RFR: 1015: Webrev can't handle changes with binary files

[Erik Joelsson]

Please review this fix, which fixes handling of binary files in webrev diffs. We should not even attempt to show diffs for binary files.

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Commit messages:
 - SKARA-1015

Changes: https://git.openjdk.java.net/cr/pull/16/files
 Webrev: https://webrevs.openjdk.java.net/?repo=cr&pr=16&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1015
  Stats: 164 lines in 1 file changed: 54 ins; 22 del; 88 mod
  Patch: https://git.openjdk.java.net/cr/pull/16.diff
  Fetch: git fetch https://git.openjdk.java.net/cr pull/16/head:pull/16

PR: https://git.openjdk.java.net/cr/pull/16