[sr-dev] [kamailio/kamailio] preprocessor directives and !trydef names (#743)

[lazedo]

hi,

in top level kamailio config file (kamailio.cfg) i have this defined
```
#!ifdef TRAFFIC_FILTER-ROLE
include_file "traffic-filter-role.cfg"
#!endif
...
####### Routing Logic ########
route
{
...
    #!ifdef TRAFFIC_FILTER-ROLE
    route(TRAFFIC_FILTER);
    #!endif
...
}
``` 
and in "traffic-filter-role.cfg" i have
```
route[TRAFFIC_FILTER]
{
...
}
```
it seems that kamailio thinks that `TRAFFIC_FILTER-ROLE` and `TRAFFIC_FILTER` are the same.
```
 0(8619) : <core> [cfg.y:3368]: yyerror_at(): parse error in config file traffic-filter-role.cfg, line 1, column 7: syntax error
 0(8619) : <core> [cfg.y:3368]: yyerror_at(): parse error in config file traffic-filter-role.cfg, line 1, column 7: invalid  route  statement
 0(8619) : <core> [cfg.y:3365]: yyerror_at(): parse error in config file traffic-filter-role.cfg, line 1, column 8-11:
ERROR: bad config file (3 errors)
 0(8619) WARNING: <core> [ppcfg.c:221]: pp_ifdef_level_check(): different number of preprocessor directives: N(#!IF[N]DEF) - N(#!ENDIF) = 1
```

if i change `TRAFFIC_FILTER-ROLE` to `TRAFFIC_FILTER_ROLE` then all is good.
is '-' character reserved in the syntax and kamailio assumes the string ended there ?

kamailio should either accept '-' has part of the defines or throw error when parsing the `TRAFFIC_FILTER-ROLE` and send something like 'invalid name in trydef' to the output




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