This ensures that definitions of functions e.g. ptsname and wcwidth are added correctly.
Fixes | ./main.c:2940:8: error: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Wint-conversion] | char *name = ptsname(*pty); | ^ ~~~~~~~~~~~~~
| ./util.c:5506:19: error: use of undeclared identifier 'wcwidth' | my_wcwidth = wcwidth; | ^