Resolve many build warnings

This patch fixes many warnings from the beginning of the build up to
and including the depend stage. Nearly all warnings should be gone
even with -Wall.

cde/programs/dtinfo/DtMmdb/dynhash/data_t.C

@@ -277,7 +277,7 @@ Boolean data_t::binaryIn(buffer& buf)
 
         break;
    }
-   buf.get(*(long*)&dt);
+   buf.get(*(char*)&dt);
    return true;
 }