Minor change to mem structure

Change to mem.TYPE from LONG variable type to OFFSET.  This prevents
4-bytes padding from throwing off values for mem.ELEMENTSIZE and
mem.IMAGE on 64-bit systems.

Patch should work on Mac, Linux, and Windows; both 32-bit and 64-bit
versions, giving the correct results for mem.ELEMENTSIZE and mem.IMAGE
from now on.

internal/c/common.cpp

@@ -453,7 +453,7 @@ struct mem_block{
   ptrszint size;
   int64 lock_id;//64-bit key, must be present at lock's offset or memory region is invalid
   ptrszint lock_offset;//pointer to lock
-  int32 type;
+  ptrszint type;
   /*
     memorytype (4 bytes, but only the first used, for flags):
     1 integer values

source/global/version.bas

@@ -4,4 +4,4 @@ DIM SHARED AutoBuildMsg AS STRING
 Version$ = "1.1"
 'BuildNum format is YYYYMMDD/id, where id is a ever-increasing
 'integer. If you make a change, update the date and increase the id!
-BuildNum$ = "20170721/56"
+BuildNum$ = "20170802/57"