RFR: 8279878: java/awt/font/JNICheck/JNICheck.sh test fails on Ubuntu 21.10

[Phil Race]

Some more signal handler related warning strings from the VM need to be excluded from what this test considers a failure 

See the bug for more info.

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Commit messages:
 - 8279878: java/awt/font/JNICheck/JNICheck.sh test fails on Ubuntu 21.10

Changes: https://git.openjdk.java.net/jdk/pull/7091/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7091&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279878
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7091.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7091/head:pull/7091

PR: https://git.openjdk.java.net/jdk/pull/7091