Clean up handling of -EB/-EL

[Richard Earnshaw]

The testsuite uses -EL on several dump tests, but this option is not 
supported for targets which are not bi-endian (eg a.out): this is the only 
reason why these tests fail.

By making the assembler accept -EL for a little-endian only assembler (and 
similarly for -EB on big-endian), we can improve the testsuite coverage 
and also make the command line option handling more uniform across the 
builds.

R.

	* tc-arm.c (md_longopts): On targets that aren't bi-endian, support
	the -EL/-EB option that matches the target's endianness.
	(md_parse_option): Likewise.


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