ARM Enhancents

[matthiasblaesing]

For the JNA project I needed a way to determine whether an ELF binary for ARM is compiled as a softfloat or hardfloat variant. For that implementation I was inspired by java-binutils. In the end I did not use the code from the project, but I think the parsing code for the ARM build attributes might also be interesting for others.

I cleaned up the code and so I propose it for inclusion into java-binutils.