Compilation Error with "use of undeclared identifier ‘ulong’"

[tomohirohiratsuka]

• Env
  • macOS Big Sur 11.0.1
  • php7.4

Hi, Firstly thank you for creating this awesome lib.
When I compile by "make", I faced this error php-mecab/mecab/mecab7.c:1459:3: error: use of undeclared identifier ‘ulong’

I'm new to C so I'm not sure this is correct fix way but when I added an declaration #define ulong unsigned long on top of mecab7.c file, compilation was done successfully.

I'll create pull request for this issue, I'm glad if you check it.
Thank you.