+ added wasip2 to the compiler help screen (marked as experimental)

compiler/msg/errore.msg

@@ -4416,6 +4416,7 @@ Z*2Tzxspectrum_ZX Spectrum
 W*2Tembedded_Embedded
 W*2Twasip1_The WebAssembly System Interface Preview 1 (WASI 0.1)
 W*2Twasip1threads_The WebAssembly System Interface Preview 1 with Multithreading (WASI 0.1 + wasi-threads)
+W*2Twasip2_The WebAssembly System Interface Preview 2 (WASI 0.2) (experimental)
 # end of targets section
 **1t<x>_Target architecture
 **2*_ * Defines FPC_SUBTARGET_<x>