don't crash on test failure on macos

Author: kivikakk

api_test/CMakeLists.txt

@@ -26,5 +26,5 @@ if(MSVC)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /wd4706 /D_CRT_SECURE_NO_WARNINGS")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /TP")
 elseif(CMAKE_COMPILER_IS_GNUCC OR "${CMAKE_C_COMPILER_ID}" STREQUAL "Clang")
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -std=c99 -pedantic -D_BSD_SOURCE -D_POSIX_SOURCE")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -std=c99 -pedantic")
 endif()