web/download: move the <h2> of each toolchain out of its main div.

I find it looks better. :)

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6289 4407c894-4637-0410-b4f5-ada5f102cad1
web/download: remove explanation of the differences between crt v2 and v3.

With v3 becoming stable and everything moving to it, there's very little
reason to keep it and it makes people quite confused.

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6290 4407c894-4637-0410-b4f5-ada5f102cad1
web/download: mention that POSIX threading adds a dependency on pthreads.

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6291 4407c894-4637-0410-b4f5-ada5f102cad1
web/download: move mingw-builds as the first toolchain.

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6292 4407c894-4637-0410-b4f5-ada5f102cad1
web/download: clearly state that dwarf2 should be avoided.

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6293 4407c894-4637-0410-b4f5-ada5f102cad1
web/download: note that for windows hosts, mingw-builds should be preferred

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6294 4407c894-4637-0410-b4f5-ada5f102cad1
web: update the main page for CRTv3.

(and sneak in a couple small changes for the download page too)

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6295 4407c894-4637-0410-b4f5-ada5f102cad1
intrin.h: Fixes for GCC 4.9.

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6296 4407c894-4637-0410-b4f5-ada5f102cad1
v3 branch

git-svn-id: https://svn.code.sf.net/p/mingw-w64/code@6297 4407c894-4637-0410-b4f5-ada5f102cad1