[exim] gcc 8.3 warnings and local scan

Hi

I'm getting this warnings when compiling local scan functions with
gcc 8.3 and Exim 4.93

geoip.c:16:11: warning: implicit declaration of function ‘string_copy’; 
did you mean ‘strncpy’? [-Wimplicit-function-declaration]
   *yield = string_copy(US"Bad number of arguments");
            ^~~~~~~~~~~
            strncpy
geoip.c:16:9: warning: assignment to ‘uschar *’ {aka ‘unsigned char *’} 
from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
   *yield = string_copy(US"Bad number of arguments");
          ^

--
Best regards ...

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    David Saez
    On-Line Services 2000 S.L.
    http://www.ols.es
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