Zig debug builds automatically enable ubsan.
As the fix for #1891 had to be reverted, debug builds using zig will crash like so:
```
Illegal instruction at address 0x3237d2
raylib/src/rlgl.h:3690:91: 0x3237d2 in rlDrawVertexArrayElements (/home/rcorre/src/raylib-zig-template/raylib/src/rcore.c)
glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_SHORT, (const unsigned short *)buffer + offset);
```
This disables UBSAN when using zig to build raylib.
Ryan Roden-Corrent
a316f9e7fc