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Make the HAVE_HF_ITER define target-specific

Leaking HAVE_HF_ITER into the entire build just because fuzzpuzz
wanted it was ugly, and also this needs fewer lines of CMake code.

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -279,11 +279,8 @@

   write_generated_games_header()

   include(CheckFunctionExists)

   check_function_exists(HF_ITER HAVE_HF_ITER)

-  if(HAVE_HF_ITER)

-    add_definitions(-DHAVE_HF_ITER)

-  endif()

   cliprogram(fuzzpuzz fuzzpuzz.c list.c ${puzzle_sources}

-    COMPILE_DEFINITIONS COMBINED)

+    COMPILE_DEFINITIONS COMBINED $<$<BOOL:${HAVE_HF_ITER}>:HAVE_HF_ITER>)

   target_include_directories(fuzzpuzz PRIVATE ${generated_include_dir})

 endif()