symbian: fixed typo in comment
url: only use if_nametoindex() if IFNAMSIZ is available
build: Added Visual Studio 2010 (VC10) project files

Carrying on from commit 11025613b9 added VC10 project files which are
capable of supporting side-by-side compilation, 32-bit and 64-bit
builds as well as support for some of the third-party libraries curl
uses.
Makefile.am: Missed separator in commit fbaa2f8660
README.http2: mention some alt-svc thoughts
build: Corrected Visual Studio solutions for DLL Release x64