thunk: Delete checks for old host definitions

Alpha, IA-64, and PA-RISC hosts are no longer supported.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20230808152314.102036-1-akihiko.odaki@daynix.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/exec/user/thunk.h

@@ -111,8 +111,7 @@ static inline int thunk_type_size(const argtype *type_ptr, int is_host)
         if (is_host) {
 #if defined(HOST_X86_64)
             return 8;
-#elif defined(HOST_ALPHA) || defined(HOST_IA64) || defined(HOST_MIPS) || \
-      defined(HOST_PARISC) || defined(HOST_SPARC64)
+#elif defined(HOST_MIPS) || defined(HOST_SPARC64)
             return 4;
 #elif defined(HOST_PPC)
             return sizeof(void *);