[sane-devel] demo patch for SANE 1 / SANE 2 coexistence

[stef]

	Hello,

	here's a variant to make SANE 1/SANE 2 coexist in the case of dynamic 
linking. dll.c is modified to search for backend with a soname of 2 first, 
and in case of failure, it searches backend a a 1 soname. This way if an 
out-of-tree backend in installed, it will still be usable by a SANE 2, and 
automaticaly searched and found.
	To allow SANE 1 frontends using SANE 2 backends, there is still a sane2 meta 
backend that is linked and installed with a 1 soname by the SANE 2 build 
system. This meta backend takes care of the SANE 1/SANE 2 API differences. I 
have also tested that copying this libsane-sane2.so.1 library as  
libsane.so.1 (overwriting the one from sane-1.0.19) allowed a SANE 1 frontend 
to detect and use SANE 2 backends installed without prefixing the device name 
with 'sane2'. So by tweaking the install process of SANE 2, SANE 1 
installation would be able to use SANE 2 backends without any change.

Regards,
	Stef


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