SPIRV-Tools include directory was missing, and all projects should link
using the static runtime library.

Bug b/123642959

Change-Id: I8ab915270115c810a91ff013d56a5bbb0a01d4a1
Reviewed-on: https://swiftshader-review.googlesource.com/c/24708Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>