fix lazybuild path

[kassane]

Tested on zig 0.12.0-dev.1139+4d106076c version.

zig build -Doptimize=ReleaseFast --summary all
info: [RUN] "git" "clone" "https://github.com/marler8997/iguanaTLS" "/home/kassane/Documentos/ziget/dep/iguanaTLS"
Cloning into '/home/kassane/Documentos/ziget/dep/iguanaTLS'...
remote: Enumerating objects: 394, done.
remote: Counting objects: 100% (112/112), done.
remote: Compressing objects: 100% (35/35), done.
remote: Total 394 (delta 87), reused 90 (delta 76), pack-reused 282
Receiving objects: 100% (394/394), 236.62 KiB | 1.18 MiB/s, done.
Resolving deltas: 100% (239/239), done.
info: [RUN] "git" "-C" "/home/kassane/Documentos/ziget/dep/iguanaTLS" "checkout" "91d22df192d1df1022352df49f41c1a90ca8327d" "-b" "fordep"
Switched to a new branch 'fordep'
Build Summary: 4/4 steps succeeded
install success
└─ install ziget success
   └─ zig build-exe ziget ReleaseFast native success 15s MaxRSS:300M
      └─ clone git repository 'iguanaTLS' success

Reference:

• Error in zig build zigup#103

cc: @marler8997