[xmlsec] build fixes for 1.2.10

[Aleksey Sanin]

Thanks! I've committed everything but the rpath change (I agree, it is
probably not a good idea for some platforms).

Thanks again!

Aleksey

Roumen Petrov wrote:
> Please find attached file "xmlsec1-1.2.10.patch".
> 
> The patch solve folowing problems:
> - autoconf 2.59 fail to create configure;
> - messages for detecting libxml2 if configure without pkg-config enabled 
> and print version found;
> - messages for detecting libxslt if configure without pkg-config enabled 
> and print version found;
> - use rpath to link with openssl when path is psecified (may be this 
> shouldn't go mainstream);
> - print openssl version found;
> - add support for nss from seamonkey;
> - don't create many times output files .
> 
> 
> Roumen
> 
> 
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