RFR: 8145936 - Fixes required to build and run Zero arm64 iOS Mobile JRE

[Magnus Ihse Bursie]

Looks good to me. 

/Magnus

> 21 dec. 2015 kl. 21:18 skrev Bob Vandette <bob.vandette at oracle.com>:
> 
> http://cr.openjdk.java.net/~bobv/8145936/webrev.00/
> 
> Please review the following fixes that were required to complete the 
> initial bringup of the iOS ARM64 Zero Java runtime in the JDK 9 Mobile/dev forest.
> 
> 1. Change the VAR_CPU_ARCH for 64-bit to "arm" from “aarch64 in order to 
> ensure that OPENJDK_TARGET_CPU_ARCH is set to CPU architecture family
> and not specific architecture version.  This is the way x86/x86_x64 is also handled.
> 
> 2. Add the SocketOption and UnixConstant template files into the JDK repo.
> These are required for cross compilation builds since the genSocketOption
> and genUnixConstants programs cannot be run on the build system.
> 
> 3. Add a macosx directory for iOS build in the NIO makefile.
> Exclude the UTIFileTypeDetector.c file from the iOS build since it
> is dependent on a Framework that is not available in iOS.  We probably 
> should remove the entire MacOSXFileSystemProvider set of classes.
> Currently the default provider for iOS is Bsd.
> 
> Bob Vandette
>