Replace hardwired error handler in go32_create_inferior

Replace hardwired error handler in go32_create_inferior

go32_create_inferior invokes a hardwired fprintf/exit error handler
if v2loadimage fails.  I could find no reason for this other than that
the block seems to have been copy-and-pasted from v2loadimage's
manpage.  This commit replaces the hardwired handler with a call to
error.

gdb/ChangeLog:

	* go32-nat.c (go32_create_inferior): Replace a fprintf/
	exit pair with a call to error.  Wrap the message with _().