Revert "Add libgd library"

This reverts commit 4b9349e.

Author: adazem009

CMakeLists.txt

@@ -65,8 +65,6 @@ include_directories(thirdparty/zip/src)
 
 include_directories(thirdparty/spimpl)
 
-include(build/FindGD.cmake)
-
 target_link_libraries(scratchcpp PRIVATE nlohmann_json::nlohmann_json)
 target_link_libraries(scratchcpp PRIVATE utf8cpp)
 target_link_libraries(scratchcpp PRIVATE zip)