Log Message:
Update to 1.6d.

Version 1.6d of cxref released : Mon Oct 3 14:00:00 2011
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Bug fixes
 Updated for latest version of autoconf.
 Allow structure initialisers to have multiple components (e.g. a.b=1).
 Remove gcc warning messages.
 Change Makefile for better comptibility with FreeBSD.

Version 1.6c of cxref released : Mon May 31 10:00:00 2010
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Bug fixes
 Handle the gcc __builtin_offsetof() and offsetof() functions.
 Check that the lex/yacc programs actually exist at configure time.
 Handle ASM statements with named identifiers in them.

Parsing changes
 Removed the char_varying type.

Document changes
 Update web page links