Delete unused imtable field

Bug: 17643507

Change-Id: I1fc7ca2d3bdf1810bcc3b46f867b68a4a6d28ed3

(cherry picked from commit f2d556401ec1d82fec31c0b29d712de18d838282
diff --git a/runtime/image.cc b/runtime/image.cc
index 40f4346..aee84bc3 100644
--- a/runtime/image.cc
+++ b/runtime/image.cc
@@ -24,7 +24,7 @@
 namespace art {
 
 const uint8_t ImageHeader::kImageMagic[] = { 'a', 'r', 't', '\n' };
-const uint8_t ImageHeader::kImageVersion[] = { '0', '1', '1', '\0' };
+const uint8_t ImageHeader::kImageVersion[] = { '0', '1', '2', '\0' };
 
 ImageHeader::ImageHeader(uint32_t image_begin,
                          uint32_t image_size,