tc-xgate.c formatting

[Alan Modra]

I'm about to commit this tidy of tc-xgate.c, done when I removed uses
of fx_pcrel_adjust, but I see Sean beat me to that.  Sean, in future
please post your patches to the binutils list even if they are fairly
trivial.

	* config/tc-xgate.c: Make some functions static.  Formatting
	style and whitespace fixes.  Wrap overly long lines.  Format
	help message.

-- 
Alan Modra
Australia Development Lab, IBM
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