RFR: 8220074: Clean up GCC 8.3 errors in LittleCMS

[Yasumasa Suenaga]

Hi all,

Please review this change:

   JBS: https://bugs.openjdk.java.net/browse/JDK-8220074
   webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8220074/webrev.00/

I saw some -Wstringop-truncation warnings in LCMS when I build OpenJDK with GCC 9.2.1 on Fedora 31.
They are LCMS problems, thus we should avoid them to disable these warnings.

This change has been tested on submit repo (mach5-one-ysuenaga-JDK-8220074-20191112-1334-6642576).


Thanks,

Yasumasa