Update to zig 0.14

[SoraTenshi]

With zig having their 0.14 release, i thought i update our build system support :)

[Techatrix]

These changes look good to me.

One thing that could be improved would be to use the addLibrary function combined with a "linkage" build option like this:

const linkage = b.option(std.builtin.LinkMode, "linkage", "Link mode") orelse .static;

const lib = b.addLibrary(.{
    .linkage = linkage,
    .name = "capstone",
    .root_module = b.createModule(.{
        .target = target,
        .optimize = optimize,
        .pic = pic,
        .strip = strip,
        .link_libc = true,
    }),
});

This is how the Zig 0.14.0 release notes suggested it.

[SoraTenshi]

@Techatrix i adjusted it to your comment.
Can you look over it again? Locally it compiled and run-all-tests also yielded no error.
cstool also built.