update translate-c to work recursively and fix bug where calling getGraph would cache too early (outside of "make" step)

[silbinarywolf]

Changelog

• update translate-c to work recursively
• fix bug where calling getGraph would cache too early (outside of "make" step)

The bug with getGraph could cause the following crash:

thread 68890 panic: attempt to use null value
/home/jae/Tools/zig/current/lib/std/Build/Step/Compile.zig:1309:88: 0x142802c in getZigArgs (std.zig)
                        const import_index = cli_named_modules.modules.getIndex(import).?;
                                                                                       ^
/home/jae/Tools/zig/current/lib/std/Build/Step/Compile.zig:1787:36: 0x15e259f in make (std.zig)
    const zig_args = try getZigArgs(compile, false);
                                   ^
/home/jae/Tools/zig/current/lib/std/Build/Step.zig:278:33: 0x148cdbf in make (std.zig)
    const make_result = s.makeFn(s, options);
                                ^
/home/jae/Tools/zig/current/lib/compiler/build_runner.zig:1345:26: 0x148adfe in makeStep (build_runner.zig)
        } else if (s.make(.{
                         ^
/home/jae/Tools/zig/current/lib/std/Io.zig:1245:17: 0x148aa25 in start (std.zig)
                _ = @as(Cancelable!void, @call(.auto, function, args_casted.*)) catch {};
                ^
/home/jae/Tools/zig/current/lib/std/Io/Threaded.zig:552:22: 0x124b165 in start (std.zig)
            task.func(task.contextPointer());
                     ^
/home/jae/Tools/zig/current/lib/std/Io/Threaded.zig:1797:29: 0x1249364 in worker (std.zig)
            runnable.startFn(runnable, &thread, t);
                            ^
/home/jae/Tools/zig/current/lib/std/Thread.zig:422:13: 0x1249045 in callFn__anon_27841 (std.zig)
            @call(.auto, f, args);
            ^
/home/jae/Tools/zig/current/lib/std/Thread.zig:1431:30: 0x1248e00 in entryFn (std.zig)
                return callFn(f, self.fn_args);
                             ^
/home/jae/Tools/zig/current/lib/std/os/linux/x86_64.zig:105:5

Fixes #91