gnu: zig: Increase max-silent-time.

* gnu/packages/zig.scm (zig-0.10)[properties]: Set max-silent-time to 3
hours.

gnu/packages/zig.scm

@@ -112,6 +112,8 @@ toolchain.  Among other features it provides
     ;; Currently building zig can take up to 10GB of RAM for linking stage1:
     ;; https://github.com/ziglang/zig/issues/6485
     (supported-systems %64bit-supported-systems)
+    ;; Stage3 can take a lot of time and isn't verbose.
+    (properties `((max-silent-time . 9600)))
     (license license:expat)))
 
 (define-public zig-0.9