RFR: 8211362: Restrict export of libjpeg symbols from libjavafx_iio.so

[Kevin Rushforth]

On Thu, 25 Mar 2021 12:02:25 GMT, Johan Vos <jvos at openjdk.org> wrote:

> Fix for JDK-8211362
> 
> Compile javafx-iio native files with -f-visibiliy=hidden in order
> not to export the non-JNI symbols.
> Although this issue was about libjavafx_iio.so only (and not about libjavafx_iio.a), this PR allows fixing the static build as well.
> 
> For static builds, we also use ld -r to build a static library, so that objcopy or similar can be used to remove the names of the
> hidden symbols.

Looks good. Test build passed. I confirmed that the internal jpeg symbols are now hidden.

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Marked as reviewed by kcr (Lead).

PR: https://git.openjdk.java.net/jfx/pull/442