[Ada] armhf-linux: symbolic tracebacks

[Pierre-Marie de Rodat]

Implement symbolic tracebacks on armhf-linux.  It's an ELF target so
just a matter of some bookkeeping changes.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* libgnat/s-objrea.ads (Object_Arch): Add ARM enum
	* libgnat/s-objrea.adb (Initialize): Add EM_ARM case.
	(Read_Address): Add ARM case to 32bit read.
	* Makefile.rtl: Add trasym units to the runtime for armhf-linux.
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