RFR: JDK-8200178 Remove mapfiles for JDK native libraries

[Martin Buchholz]

I can't find any documentation for what JNIEXPORT and friends actually do.
People including myself have been cargo-culting JNIEXPORT and JNICALL for
decades.
Why aren't they in the JNI spec?

---

It's fishy that the attribute externally_visible (which seems very
interesting!) is ARM specific.

  #ifdef ARM
    #define JNIEXPORT
 __attribute__((externally_visible,visibility("default")))
    #define JNIIMPORT
 __attribute__((externally_visible,visibility("default")))
  #else
    #define JNIEXPORT     __attribute__((visibility("default")))
    #define JNIIMPORT     __attribute__((visibility("default")))
  #endif
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