grok compile warning

[czanik]

After compiling incubator with grok support on openSUSE, I get the following error message from post build checks (which fails the package building process):

[   23s] E: syslog-ng-incubator 64bit-portability-issue modules/grok/grok-parser-grammar.y:400

The offending messages from the build logs are:

[   19s]   CC       modules/grok/modules_grok_libgrok_parser_la-grok-parser-grammar.lo
[   19s] modules/grok/grok-parser-grammar.y: In function 'grok_parse':
[   19s] modules/grok/grok-parser-grammar.y:400:5: warning: implicit declaration of function 'grok_instance_new' [-Wimplicit-function-declaration]
[   19s]          : KW_GROK_MATCH { last_grok_instance = grok_instance_new(); }  '(' string grok_instance_options ')' { grok_instance_set_pattern(last_grok_instance, $4); free($4); }
[   19s]      ^
[   19s] modules/grok/grok-parser-grammar.y:400:26: warning: assignment makes pointer from integer without a cast [enabled by default]
[   19s]          : KW_GROK_MATCH { last_grok_instance = grok_instance_new(); }  '(' string grok_instance_options ')' { grok_instance_set_pattern(last_grok_instance, $4); free($4); }
[   19s]                           ^
[   19s]   CC       modules/grok/modules_grok_libgrok_parser_la-grok-parser.lo