[sr-dev] [kamailio/kamailio] Using undefined environmental variables with #!defenv (Issue #2967)

[Ben Kaufman]

### Description

Currently, an undefined environmental variable with `#!defenv` results in Kamailio failing to start.  The proposal  here that if the environmental variable is not defined, then the macro value would be undefined as well.  For example:

```
!#KAMAILIO
loadmodule "xlog"
loadmodule "pv"

#!defenv FOO

request_route {
    #!ifdef FOO
        xlog("L_INFO","Environmental variable $$FOO is set\n");
    #!else
        xlog("L_WARN","Environmental variable $$FOO is NOT set\n");
    #!endif
    forward();
}
```

Currently this configuration will fail to load if environmental variable is not set.  My proposal is to either allow `#!envdef` to accept an undefined environmental variable and have the preprocessor macro undefined, or to add a new keyword (`#!envdefn` perhaps?) to allow this behavior.


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https://github.com/kamailio/kamailio/issues/2967
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