dns plugin: Do not use headers from glibc
authorPavel Rochnyack <pavel2000@ngs.ru>
Wed, 15 May 2019 07:33:02 +0000 (14:33 +0700)
committerPavel Rochnyack <pavel2000@ngs.ru>
Wed, 15 May 2019 07:37:32 +0000 (14:37 +0700)
glibc has removed __NAMESER and __BIND symbols from their codebase.

There is no benefits of use defines from glibc, so replaced them by numbers.

Closes: #3145


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