D18866: Use check_symbol_exists instead of check_function_exists

[Heiko Becker]

heikobecker created this revision.
Herald added a project: Calligra: 3.0.
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heikobecker requested review of this revision.

REVISION SUMMARY
  check_function_exists has some shortcomings, which fails to detect
  isnan when build against musl libc. The cmake documentation [1]
  suggests to prefer check_symbol_exists, which detects isnan/isinf
  fine on both glibc and musl.
  
  [1] https://cmake.org/cmake/help/latest/module/CheckFunctionExists.html#command:check_function_exists

TEST PLAN
  Builds with glibc and musl

REPOSITORY
  R8 Calligra

BRANCH
  master

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

AFFECTED FILES
  filters/words/msword-odf/wv2/CMakeLists.txt

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