contrib/single_file_libs/zstd-in.c doesn't #include source files in dictBuilder/, meaning the various ZDICT_ symbols aren't included in the single file library.

Note that if you add the dictBuilder/ source files, you get various symbol collisions building the resulting file. Colliding symbols include prime4bytes, DEFAULT_SPLITPOINT, g_displayLevel, g_time, and others.

Should dictBuilder/ source files be included in the single file full library by default?