add: check version of virtual packages

(cherry picked from commit afe80baf)

src/app_add.c

@@ -134,7 +134,8 @@ static int add_main(void *ctx, struct apk_database *db, struct apk_string_array
 		apk_blob_pull_dep(&b, db, &virtdep);
 
 		if (APK_BLOB_IS_NULL(b) || virtdep.conflict ||
-		    (virtdep.name->name[0] != '.' && non_repository_check(db)))
+		    (virtdep.name->name[0] != '.' && non_repository_check(db)) ||
+		    virtdep.broken)
 			goto bad_spec;
 
 		switch (virtdep.result_mask) {

test/error6.test

+@ARGS
+--test-instdb basic.installed
+add -t .virtual>1
+@EXPECT
+ERROR: .virtual>1: bad package specifier

test/error7.test

+@ARGS
+--test-instdb basic.installed
+add -t .virtual=invalid
+@EXPECT
+ERROR: .virtual=invalid: bad package specifier