RFR: 8295812: Skip the "half float" support in LittleCMS during the build

[Sergey Bylokhov]

The Java2d do not use "half" float in the image layouts, so we can disable it in the LittleCMS library during the build. It is possible to do using [this](https://github.com/openjdk/jdk/blob/master/src/java.desktop/share/native/liblcms/lcms2.h#L85) public option:


// Uncomment to get rid of the tables for "half" float support
// #define CMS_NO_HALF_SUPPORT 1


This change cuts not only the unused by java2d functions but also [such](https://github.com/openjdk/jdk/blob/739769c8fc4b496f08a92225a12d07414537b6c0/src/java.desktop/share/native/liblcms/cmshalf.c#L63) tables.

The size of liblcms decreased by 20 kB on Linux(536024 vs 515152) and 15 kB on windows(246784 vs 231424). On macOS the  win is only 300 bytes.

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Commit messages:
 - 8295812: Skip the "half float" support in LittleCMS during the build

Changes: https://git.openjdk.org/jdk/pull/10830/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10830&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295812
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10830.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10830/head:pull/10830

PR: https://git.openjdk.org/jdk/pull/10830