Fix function types

[michaelortmann]

Found by: michaelortmann
Patch by: michaelortmann
Fixes:

One-line summary:
Fix function types

Additional description (if needed):
Some function types in eggdrop did not match.
Like a function parameter is declared as const char* in one place, but char* in another place.

Test cases demonstrating functionality (if applicable):
Fixes undefined behavior like:

.rehash
[19:42:49] tcl: builtin dcc call: *dcc:rehash -HQ 1 
[19:42:49] #-HQ# rehash
Rehashing.
[19:42:49] Writing user file...
.././console.mod/console.c:110:27: runtime error: call to function masktype through pointer to incorrect function type 'const char *(*)(int)'
/home/michael/projects/eggdrop/src/flags.c:142: note: masktype defined here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior .././console.mod/console.c:110:27 
.././console.mod/console.c:111:15: runtime error: call to function stripmasktype through pointer to incorrect function type 'const char *(*)(int)'
/home/michael/projects/eggdrop/src/cmds.c:2581: note: stripmasktype defined here
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior .././console.mod/console.c:111:15