RFR: 8305321: Remove unused exports in java.desktop [v5]

[Daniel Jeliński]

> Please review this patch that removes a number of unused exports from java.desktop native libraries.
> 
> In most cases I removed JNIEXPORT from methods and variables that are only used within a single shared library. Other than that:
> - removed `getSunFontIDs` that was reportedly used by rasterizer; as far as I could tell, rasterizer project is dead now, but if that's incorrect I can restore that export.
> - removed `colorValueID` in X11Color; that field was not used.
> - removed `J2dTraceInit` from header file. That method is only used internally by `J2dTraceImpl`.
> 
> The methods `Transform_GetInfo` and `Transform_transform` are declared in GraphicsPrimitiveMgr, but are only used in TransformHelper. Let me know if I should move them to where they are used.
> 
> The method `img_makePalette`, currently located in `share/native/libawt/awt/image/cvutils/img_colors.c`, is only used by `unix/native/common/awt/X11Color.c`; it could be moved to the same directory to avoid exporting the method from libawt. The files `img_colors.[ch]` do not have any references to other files in `cvutils`.
> 
> Manually verified that the exports are no longer present after these changes. Tier1-3 and client libs tests still pass.

Daniel Jeliński has updated the pull request incrementally with seven additional commits since the last revision:

 - Revert "Remove Color_initIDs"
   
   This reverts commit 8a8c9a63de14773905a64a8067ddd68c8a6ab137.
 - Revert "Remove KeyboardFocusManager_initIDs"
   
   This reverts commit 66bd9a136b4c34d7d600ad49ce67fcd060160fb8.
 - Revert "Remove Rectangle_initIDs"
   
   This reverts commit 0d21e361cd92215bbc8bb971b5c3f26898b96a0b.
 - Revert "Remove Button_initIDs"
   
   This reverts commit 423afbf3b61cad504ae10a99ceb02c318f3a83ae.
 - Revert "Remove FileDialog_initIDs"
   
   This reverts commit e66a9ffdda6e451c4298f59786adbd434dd1adb5.
 - Revert "Remove TextField_initIDs"
   
   This reverts commit 0c3b78d27b899d4301f8326f90f1cc36703cbd3d.
 - Revert "Update copyright"
   
   This reverts commit 5808c65e5fbabc08b43da982736b40db87000cb5.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13261/files
  - new: https://git.openjdk.org/jdk/pull/13261/files/5808c65e..130baf3c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13261&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13261&range=03-04

  Stats: 362 lines in 17 files changed: 346 ins; 3 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/13261.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13261/head:pull/13261

PR: https://git.openjdk.org/jdk/pull/13261