[RFC]: win32-nat.c better handling of DLL relocation

["Raoul Gough" <RaoulGough at yahoo dot co dot uk>]

win32-nat.c currently only passes the loaded address of the .text
section into symbol_file_add, which means that any symbols from .data
or .bss don't get fixed up properly. This patch fixes the problem by
calculating the load addresses of all sections known to bfd.

I recently posted a test case which demonstrates the relocation
problem in the "coffread.c extension" thread (message ID
avejk1$lv6$1@main.gmane.org, posted 7 Jan 2003 13:10:49 -0000). This
showed that gdb 5.2.1 didn't handle any DLL symbol relocations. The
current CVS version only handles the .text section. With this patch,
it handles all sections correctly.

Raoul Gough.

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