Win32 compile fixes

[jmue]

When building an external application against LibRaw I get following compiler warning with VS2010:

warning C4251: 'LibRaw_file_datastream::f' : class 'std::auto_ptr<_Ty>' needs to have dll-interface to be used by clients of class 'LibRaw_file_datastream'
1> with
1> [
1> _Ty=std::streambuf
1> ]

This patch fixes the warning.

Regards, Jens

[LibRaw]

Could you please remove patch 5d926cb from pull request? I want to close the request by 'merge pull request' but 5d926cb is another story.

[jmue]

Argh, this 5d926cb patch is ugly. It is on my master branch and I reverted it with b6b68ea. (Please check https://github.com/jmue/LibRaw/blame/win32_compile_fixes/libraw/libraw_version.h ) But I could not get it out of my history with a 'git reset'. So three different options

1. you fix it on your branch (fine for me)
2. you take my ugly history or bring the three 3 commits in a single commit
3. I trash my git clone, fork again and fix it again

Sorry!

[LibRaw]

I've fixed the my master branch by hand and pushed to GitHub.

Thanks for fixes.