Ensure phoneme type is set before start/endtype.

The eSpeak code uses `end_type` for the `voicingswitch` property
when used with consonants. It also allows `endtype` to be specified
in consonants if it is the same as `starttype`.

This code adds a check in the `starttype` and `endtype` handlers
to ensure that the phoneme type has been set to preserve the
eSpeak behaviour for these properties.

src/libespeak-ng/compiledata.c

@@ -2142,12 +2142,16 @@ int CompilePhoneme(int compile_phoneme)
 				if (phcode == -1)
 					phcode = LookupPhoneme(item_string, 1);
 				phoneme_out->start_type = phcode;
+				if (phoneme_out->type == phINVALID)
+					error("a phoneme type or manner of articulation must be specified before starttype");
 				break;
 			case kENDTYPE:
 				phcode = NextItem(tPHONEMEMNEM);
 				if (phcode == -1)
 					phcode = LookupPhoneme(item_string, 1);
-				if (phoneme_out->type == phVOWEL)
+				if (phoneme_out->type == phINVALID)
+					error("a phoneme type or manner of articulation must be specified before endtype");
+				else if (phoneme_out->type == phVOWEL)
 					phoneme_out->end_type = phcode;
 				else if (phcode != phoneme_out->start_type)
 					error("endtype must equal starttype for consonants");