[8u] RFR 8198412: MonospacedGlyphWidthTest.java may fail on Solaris

[Zhengyu Gu]

I would like to backport this patch to 8u for parity with Oracle 8u281.

The original patch does not apply cleanly, due to there is no 
corresponding entry in 8u's ProblemList. The fix for the test actually 
applied cleanly.

The original bug: https://bugs.openjdk.java.net/browse/JDK-8198412
The original patch: http://hg.openjdk.java.net/jdk/jdk/rev/752645a158ff

8u webrev: http://cr.openjdk.java.net/~zgu/JDK-8198412-8u/webrev.00/

Thanks,

-Zhengyu