D18866: Use check_symbol_exists instead of check_function_exists

[Heiko Becker]

heikobecker marked an inline comment as done.

REPOSITORY
  R8 Calligra

REVISION DETAIL
  https://phabricator.kde.org/D18866

To: heikobecker
Cc: pino, danders, Calligra-Devel-list, dcaliste, cochise, vandenoever
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