+ enabled test units/sysutils/tffirst.pp for the WASI platform

tests/test/units/sysutils/tffirst.pp

@@ -1,4 +1,4 @@
-{ %target=linux,freebsd,openbsd,netbsd,win32,win64,darwin,haiku,morphos }
+{ %target=linux,freebsd,openbsd,netbsd,win32,win64,darwin,haiku,morphos,wasi }
 
 {$codepage utf8}