moved the config-*.h files from root to the lib/ dir

diff --git a/config-mac.h b/lib/config-mac.h
similarity index 100%
rename from config-mac.h
rename to lib/config-mac.h

diff --git a/config-riscos.h b/lib/config-riscos.h
similarity index 100%
rename from config-riscos.h
rename to lib/config-riscos.h

diff --git a/config-vms.h b/lib/config-vms.h
similarity index 100%
rename from config-vms.h
rename to lib/config-vms.h

diff --git a/config-win32.h b/lib/config-win32.h
similarity index 100%
rename from config-win32.h
rename to lib/config-win32.h