Toolchain: Add LLVM patch and script for building it

This contains all the bits and pieces necessary to build a Clang binary
that will correctly compile SerenityOS.

I had some trouble with getting LLVM building with a single command, so
for now, I decided to build each LLVM component in a separate command
invocation. In the future, we can also make the main llvm build step
architecture-independent, but that would come with extra work to make
library and include paths work.

The binutils build invocation and related boilerplate is duplicated
because we only use `objdump` from GNU binutils in the Clang toolchain,
so most features can be disabled.

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