Makefile and tz classes change.

[Xueming Shen]

Hi,

With this proposed the change, the jdk8_threeten repository can be built as
a normally jdk8 repository and fully functions.

http://cr.openjdk.java.net/~sherman/jdk8_threeten/make_tz/webrev/

The changes are

(1) corresponding Makefile changes
(2) add the tzcompiler tool for generating the tzdata during build time
(3) update the tzdb compiler to use the build-in jdk8 tz data.
(4) "hardwired" TzdbZoneRuleProvider to be the default tz rule provider
      (arguably we might want to look into the service lookup at static init
       code for startup performance concern, but that can be dealt with 
later)

Please help take a look.

Will add a ant build.xml later. The testng tests don't work with the 
jtreg (yet).

Thanks
-Sherman