Use correct product string

[dmik]

Currently, Java identifies itself as an internal build by dmik. This needs to be fixed. It should say what it says on other platforms.

[dmik]

In order to set the correct product thing, the following must be defined in the build environment:

/**
 * JDK build number in format 'bNN'.
 */
call EnvSet 'BUILD_NUMBER', 'b19'

/**
 * Milestone name. Will appear in the version string after the verison number
 * and before the build number.
 */
call EnvSet 'MILESTONE', 'rc'

Once done correctly, this will supersede generation of the internal product string and produce a nice string like "1.6.0-rc-b19" instead.

The above statements are part of LocalEnv.tpl.cmd accidentally committed in r263.