[RFA] Large corefile support; Was: [wip]

[Andrew Cagney]

Hello,

Here's todays version.  It now uses autoconf magic to hard-wire the 
underlying type of file_ptr.  I've used the heuristic:

if fseeko64 && ftello64
	there must be off64_t
	make file_ptr 64-bit
else if fseeko && ftello
	there must be off_t >= sizeof long
	make file_ptr 64-bit (if off_t is 8) or long otherwize
else
	make file_ptr long
fi

I've called the internal functions "real_fseek" and "real_fread" (to 
match real_read).  The header "bfdio.h" makes them available to "cache.c".

My bigcore GDB testcase (along with the rest of the GDB testsuite look 
ok).  Need to double check the binutils testsuite.

After that, ok?
Andrew
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