[11] RFR for JDK-8202476: ImageLib is broken in 32 bit Windows

[Alexey Ivanov]

Hi,

Could you please review the following fix for jdk11?

bug: https://bugs.openjdk.java.net/browse/JDK-8202476
webrev: http://cr.openjdk.java.net/~aivanov/8202476/jdk11/webrev.0/

This is a follow-up fix for JDK-8201226 which enabled building JDK for 
32 bit Windows, its code review: 
http://mail.openjdk.java.net/pipermail/build-dev/2018-April/021553.html

I found this issue:
http://mail.openjdk.java.net/pipermail/2d-dev/2018-April/009150.html


This fix removes JNICALL modifiers from exported functions in medialib.
After the fix, the failing tests in test/jdk/java/awt/image pass.


Thank you in advance.

Regards,
Alexey