RFR: jcheck should allow tabs in Makefile

Tue Mar 16 16:43:26 UTC 2021

As the title says. I forgot to add the exception to jcheck to allow leading tabs in Makefiles.

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Commit messages:
 - jcheck should allow tabs in Makefile

Changes: https://git.openjdk.java.net/guide/pull/51/files
 Webrev: https://webrevs.openjdk.java.net/?repo=guide&pr=51&range=00
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/guide/pull/51.diff
  Fetch: git fetch https://git.openjdk.java.net/guide pull/51/head:pull/51

PR: https://git.openjdk.java.net/guide/pull/51