winedbg: resend: analyse far calls in be_i386_is_func_call

[Jeff L]

Fixes some things Eric pointed out.  Have not tested the far calls as I 
don't have anything that generates them.

This patch came about when I was looking at why single stepping seemed
to stuff up after a call.  It breaks down the calls for 32 bit mode
calls but not necessarily 16 and not 64 bit calls.  It is a fairly messy
area of knowledge and I could do with assistance as to how the 16/32/64
bit modes work.

Change log: Add code to analyse far calls in be_i386_is_func_call
instead of only near calls.

Jeff Latimer

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