For historical reasons, we have exported all symbols on macosx. This was
an issue that probably arise with the very first macosx port, and the
complication that we then used map files with a format that Xcode did
not support.
Now we don't use mapfiles anymore, and there's no reason to keep
exporting all symbols on macosx. Instead, we should only export the
public symbols, just like for all other platforms.
All platform-independent code is already properly annotated with
JNIEXPORT, but there was a few files in libosxapp that needed some
additional JNIEXPORTs.
Bug: https://bugs.openjdk.java.net/browse/JDK-8210705
WebRev:
http://cr.openjdk.java.net/~ihse/JDK-8210705-stop-exporting-all-symbols-on-macosx/webrev.01
/Magnus
