Problem (solved) compiling "urltools" on OpenBSD 7.6

Hi,

The file "alloca.h" is not present in OpenBSD. I had to apply a modification in "utf8.c" to make it compiling.

I attached the diff file I used: [utf8.txt]
(https://github.com/user-attachments/files/17334431/utf8.txt)
 

Cheers.
