fix build on newer gcc

[ghost]

I have this error:

jizvash@localhost:~/openbsd-man$ make
cc -O2 -Wall -Werror -c config.c -o config.o
cc -O2 -Wall -Werror -c strlcpy.c -o strlcpy.o
cc -O2 -Wall -Werror -c man.c -o man.o
man.c: In function ‘manual’:
man.c:752:41: error: ‘%s’ directive output may be truncated writing up to 4095 bytes into a region of size 4093 [-Werror=format-truncation=]
  (void)snprintf(buf, sizeof(buf), "%s > %s", fmt, tpath);
                                         ^~        ~~~~~
man.c:752:8: note: ‘snprintf’ output 4 or more bytes (assuming 4099) into a destination of size 4096
  (void)snprintf(buf, sizeof(buf), "%s > %s", fmt, tpath);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [Makefile:12: man.o] Error 1
jizvash@localhost:~/openbsd-man$ 

[leahneukirchen]

Note that this repo is dead, we use upstream mandoc now.

[ghost]

oh, okay