Standalone version of forklib from winnie.
This version retrieves required ntdll symbols at run time and should work on
all Windows 10 versions.
$ cmake -B x64
$ cmake --build x64 --config Release -- -maxcpucount
Note: You may want to set the FORKLIB_NOTIFY_CSRSS_FROM_PARENT and
FORKLIB_RESTORE_STDIO CMake options to OFF if you plan to build the library
for winnie.
PDBs for the ntdll DLLs that your system uses must be available, either from
the current working directory of the application or from a properly configured
symbol server path in the _NT_SYMBOL_PATH environment variable.