allow reading of JSON_REPORT_VERSION from future source release

src/buildno.h

@@ -1,3 +1,3 @@
 #define VERSION_MAJOR 3
 #define VERSION_MINOR 4
-#define VERSION_BUILD 6
+#define VERSION_BUILD 7

src/kernel/save.c

@@ -1382,7 +1382,7 @@ int readgame(const char *filename, int backup)
         assert(stream_version == STREAM_VERSION || !"unsupported data format");
     }
     assert(gdata.version >= MIN_VERSION || !"unsupported data format");
-    assert(gdata.version <= RELEASE_VERSION || !"unsupported data format");
+    assert(gdata.version <= MAX_VERSION || !"unsupported data format");
 
     gdata.encoding = enc_gamedata;
     fstream_init(&strm, F);

src/kernel/version.h

@@ -30,6 +30,7 @@
 #define AUTO_RACENAME_VERSION 345 /* NPC units with name==NULL will automatically get their race for a name */
 
 #define MIN_VERSION INTPAK_VERSION      /* minimal datafile we support */
+#define MAX_VERSION 346
 #define RELEASE_VERSION AUTO_RACENAME_VERSION /* current datafile */
 
 #define STREAM_VERSION 2 /* internal encoding of binary files */