[9] Review Request: 8078658 Make custom Cursors available for modular build

[Sergey Bylokhov]

Hello.
Please review the fix for jdk9.
The usage of getResource() was changed to getResourceAsStream(). Note 
that before the fix the toolkit.getImage() cached the image, but it 
should not be a problem in the new code, because cursor itself is cached 
in the Cursor.getSystemCustomCursor().

Bug: https://bugs.openjdk.java.net/browse/JDK-8078658
Webrev can be found at: http://cr.openjdk.java.net/~serb/8078658/webrev.00

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Best regards, Sergey.