Current beta (x64) doesn't work on Windows 7 64bit

[winks]

> & "C:\Program Files\Rust beta 1.5\bin\cargo.exe"
Process didn't exit successfully: `rustc -vV` (exit code: -1073741515)

C:\Program Files\Rust beta 1.5\bin> .\cargo.exe
Process didn't exit successfully: `rustc -vV` (exit code: -1073741515)
C:\Program Files\Rust beta 1.5\bin> .\rustc.exe -vV
C:\Program Files\Rust beta 1.5\bin> .\rustc.exe -v

[steveklabnik]

/cc @brson

[retep998]

This was temporarily broken and a fix was already on its way but beta came out in the middle of the mess.
#29403

[alexcrichton]

Fixed in #29403 and we'll generate a new beta soon as well