[RFR]: 8186313: Additional platform definitions to support Zero builds

[John Paul Adrian Glaubitz]

Hi!

Here's the webrev for 8186313 (see [1,2,3,4]) which adds additional
architectures to platform.m4 to enable Zero builds on.

These are:

- Alpha
- M68K
- MIPSEL, MIPS, MIPS64EL, MIPS64
- SH*EB, SH*

All these are known to work in Debian , some require additional minor patches
though which I will push later. The webrev can be found in [5].

Thanks,
Adrian

> [1] http://mail.openjdk.java.net/pipermail/build-dev/2017-August/019602.html
> [2] http://mail.openjdk.java.net/pipermail/build-dev/2017-August/019603.html
> [3] http://mail.openjdk.java.net/pipermail/build-dev/2017-August/019604.html
> [4] http://mail.openjdk.java.net/pipermail/build-dev/2017-August/019605.html
> [5] http://cr.openjdk.java.net/~glaubitz/8186313/webrev.00/

-- 
  .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz at debian.org
`. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
   `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913