fix(build): drop link_libc from inline test targets

The inline-test targets added in the previous commit set link_libc=true,
which on a glibc (gnu-ABI) Linux target emits PT_INTERP=/lib64/ld-linux-x86-64.so.2.
That FHS loader path does not exist in the Nix build sandbox, so 'zig build test'
could not exec the freshly-built test binaries and the Garnix ci-linux-x86_64
check failed (GitHub Actions passed because its runners are real FHS systems).

The crc32jam/rle8182/lzh leaf modules import only std and need no libc, so
removing link_libc makes the test binaries statically linked (no PT_INTERP),
matching the existing zig_unit_tests target that already builds cleanly in the
sandbox. Verified: gnu-target test binary now has no PT_INTERP.

Author: pmarreck

build.zig

@@ -76,7 +76,6 @@ pub fn build(b: *std.Build) void {
 				.root_source_file = b.path(src_path),
 				.target = target,
 				.optimize = optimize,
-				.link_libc = true,
 			}),
 		});
 		test_step.dependOn(&b.addRunArtifact(mod_tests).step);