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ARM Enhancents #2

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matthiasblaesing
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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.

Implemented is a parser for the ELF Section, that holds the ARM
build attributes (name: .ARM.attributes). The vendor sections can be
accessed by vendor name.

For the public attributes (pseudo vendor: "aeabi") a parser for the
file wide attributes was implemented.

Section and Symbol attribuges are ignored.
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