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It appears int and t_int were freely mixed in this external, causing a size
discrepancy that can result in a buffer overflow. Since t_int is supposed to
be function pointer-sized container, it's unclear why that would be used here.
This commit changes all t_int use to int.

If t_int was really meant here for some reason then we can go in the other
direction.

for aliased zexy classes from externals/Makefile

required by the Makefile)

the main loader

This reverts commit d47295f5.

This reverts commit 3964dea2.