Avoid annoying warnings from ar included in recent binutils
Avoid annoying warnings from ar included in recent binutils

Explicitly set AR_FLAGS to "cr" to override the default value of "cru" used by
libtool which results in warnings about not supported any more "u" option from
all currently used versions of ar under Linux -- as we don't really care about
the tiny extra efficiency from using "u", just stop using it completely.

vadz/xmlwrapp,vslavik/xmlwrapp,vadz/xmlwrapp,vadz/xmlwrapp,vslavik/xmlwrapp,vslavik/xmlwrapp