[jdk11u-dev] RFR: 8302657: [11u] Add missing '(' in makefile after backport of 8218431

[Goetz Lindenmaier]

A simple fix after a backport.

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Commit messages:
 - 8302657: [11u] Add missing '(' in makefile after backport of 8218431

Changes: https://git.openjdk.org/jdk11u-dev/pull/1747/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1747&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302657
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1747.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1747/head:pull/1747

PR: https://git.openjdk.org/jdk11u-dev/pull/1747