mark unit tests which require the preprocessor

(the parser is used without preprocessor for binary WML from the addon
server so the other tests still need to succeed without preprocessing)

data/tools/wesnoth/wmlparser3.py

@@ -758,6 +758,11 @@ if __name__ == "__main__":
         def test(input, expected, note):
             test2(input, expected, note, lambda p: p.root.debug())
 
+        def test_with_preprocessor(input, expected, note):
+            if not args.wesnoth:
+                print("SKIPPED WITHOUT PREPROCESSOR " + note)
+                return
+            test(input, expected, note)
 
         test(
 """
@@ -868,7 +873,7 @@ a, b, c = 1, 2
 [/test]
 """, "multi assign 3")
 
-        test(
+        test_with_preprocessor(
 """
 #textdomain A
 #define X
@@ -938,7 +943,7 @@ foo="bar"+
 foo='bar' .. 'baz'
 """, "multi line string")
 
-        test(
+        test_with_preprocessor(
 """
 #define baz
 
@@ -950,7 +955,7 @@ foo="bar"+{baz}
 foo='bar' .. 'baz'
 """, "defined multi line string")
 
-        test(
+        test_with_preprocessor(
 """
 foo="bar" + "baz" # blah
 """,
@@ -958,7 +963,7 @@ foo="bar" + "baz" # blah
 foo='bar' .. 'baz'
 """, "comment after +")
 
-        test(
+        test_with_preprocessor(
 """
 #define baz
 "baz"
@@ -969,7 +974,7 @@ foo="bar" {baz}
 foo='bar' .. 'baz'
 """, "defined string concatenation")
 
-        test(
+        test_with_preprocessor(
 """
 #define A BLOCK
 [{BLOCK}]