32 位的对齐。再次

I faced a problem that was solved in https://GitHub.com/VirusTotal/yara/commit/9c26038171edcdc084370562703f22e649067125. Yara rules compiled by yara64.exe do not work with yara32.exe. I saw that the problem was solved by adding the field 'uint32_t unused;', but I think it is a non-persistent solution. Adding one more uint32_t raises the problem again.