Allow the any type in non-native newdecls.

sourcepawn/compiler/tests/fail-any-in-new-native.sp

@@ -0,0 +1,5 @@
+native Crab(any x);
+
+public main()
+{
+}

sourcepawn/compiler/tests/fail-any-in-new-native.txt

@@ -0,0 +1 @@
+(1) : error 156: the 'any' type is not allowed in new-style natives

sourcepawn/compiler/tests/ok-any-in-newdecl.sp

@@ -0,0 +1,3 @@
+public x(any y)
+{
+}