kc3-lang/libpng

2023-02-08T19:44:31

Clean up CMakeLists.txt * Rename the target `png` to `png_shared`. The main targets are now named `png_shared`, `png_static` and `png_framework`. * Rename the function symbol_prefix() to find_symbol_prefix(). * Rename the prefix `S` to `_SYM` in the function create_symlink(). * Rewrite the precondition checks in the function create_symlink(). * Add precondition checks to the function generate_copy(). * Delete the vestigial property CLEAN_DIRECT_OUTPUT. * Delete the variables PNG_LIB_NAME_STATIC and PNG_LIB_NAME_FRAMEWORK. * Initialize and use PNG_LIB_TARGETS consistently as a list. * Move all include() commands to the top of the file. * Acknowledge a former contributor. * Reformat.