add x86_64-linux-gnu headers

Add .tar.xz containing linux headers which can be used to generate
CppParser bindings for Linux on Windows.

The headers were collected from the following Ubunt 14.04 64bit
packages:

libc6-dev_2.19-0ubuntu6_amd64.deb
libgcc-4.8-dev_4.8.2-19ubuntu1_amd64.deb
libstdc++-4.8-dev_4.8.2-19ubuntu1_amd64.deb
linux-libc-dev_3.13.0-24.47_amd64.deb

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@iki.fi>
CppParser: add generated linux bindings

Add C# Bindings for CppParser for 64 bit Linux.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@iki.fi>
build: use linux bindings

Use CppParser C# bindings for linux when compiling on Linux.

Note: this always uses 64 bit version for now.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@iki.fi>
ParserGen: print what is being generated

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@iki.fi>
AST: Fix compilation warning

Fix the following warning by removing the new keyword:

src/AST/Type.cs(230,25): warning CS0109: The member `CppSharp.AST.PointerType.IsReference' does not hide an inherited member. The new keyword is not required

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@iki.fi>