zig: Use lazyDependencies

[kassane]

closes #47

Optional fetch dependency

• imgui: 3332ca6
• emsdk
• shdc

[kassane]

The error that occurred in MacOS was unexpected after the merge (two days of difference between PR and merge commit).

edit:

Why dub-artifact call libsokol (zig-out and global-zig-cache paths)?

duplicate symbol '_sapp_d3d11_get_render_view' in:
    /Users/runner/work/sokol-d/sokol-d/zig-out/lib/libsokol.a[3](sokol_app.o)
    /Users/runner/.cache/zig/o/0edd866490c6243cf804aae7bd00ad6c/libsokol.a[3](sokol_app.o)
duplicate symbol '_sapp_gl_get_framebuffer' in:
    /Users/runner/work/sokol-d/sokol-d/zig-out/lib/libsokol.a[3](sokol_app.o)
    /Users/runner/.cache/zig/o/0edd866490c6243cf804aae7bd00ad6c/libsokol.a[3](sokol_app.o)

[kassane]

The error that occurred in MacOS was unexpected after the merge (two days of difference between PR and merge commit).

Why dub-artifact call libsokol (zig-out and global-zig-cache paths)?

Fixed b52ef71
dub uses zig-out path and zig-build only links cache path together and ldc2/ldmd2 access both in the process.