[opus] [PATCH] remove GNUism from install doc command

[Hanspeter Niederstrasser]

doc/Makefile.am requires GNU install because it uses the -D flag when 
installing the docs.  -D doesn't exist in other flavors of install as 
found in BSD and OS X (and maybe others).  The attached patch changes 
the html docs install procedure to 2 separate commands vs the current 
single command using 'install -D'.  Tested to work on OS X 10.7 that 
uses BSD install.  Should work with GNU install as well (but no access 
to such a system to test).

Hanspeter
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