Provide better time zone mappings (i.e. tzmappings file) on AIX

[Volker Simonis]

Hi,

our current port doesn't do any special time zone mapping on AIX.

It would be nice to get a jre/lib/tzmappings file from our IBM
colleagues and implement a native to Java time zone mapping for AIX
(in jdk/src/solaris/native/java/util/TimeZone_md.c) much in the same
way as this is done on Windows.

I've opened bug "8034220: AIX: Provide better time zone mappings (i.e.
tzmappings file)" (https://bugs.openjdk.java.net/browse/JDK-8034220)
for this issue (and again any volunteer can freely assign himself for
this issue :)

Thank you and best regards,
Volker