Fixed horrendous crash in the JIT from packing change in the debug table (bug 3334, r=me).

I accidentally changed the debug table packing in a commit a while ago.  This explains the nonsense debug output and crashes people have been getting on the 1.1 branch.  Fortunately this is (mostly) detectable via the "debug.natives" table and the JIT will unpack symbols based on that information.

sourcepawn/jit/BaseRuntime.cpp

@@ -69,6 +69,11 @@ int BaseRuntime::CreateFromMemory(sp_file_hdr_t *hdr, uint8_t *base)
 	plugin->base_size = hdr->imagesize;
 	set_err = SP_ERROR_NONE;
 
+	if (hdr->version == 0x0101)
+	{
+		plugin->debug.unpacked = true;
+	}
+
 	/* We have to read the name section first */
 	for (sectnum = 0; sectnum < hdr->sections; sectnum++)
 	{
@@ -195,6 +200,10 @@ int BaseRuntime::CreateFromMemory(sp_file_hdr_t *hdr, uint8_t *base)
 		{
 			plugin->debug.stringbase = (const char *)(base + secptr->dataoffs);
 		}
+		else if (strcmp(nameptr, ".dbg.natives") == 0)
+		{
+			plugin->debug.unpacked = false;
+		}
 
 		secptr++;
 		sectnum++;