LRO support for cxgb in stable/7

[Matthew Fleming]

r193754 to stable/7 appears to have unintended code.  The MFC note
indicates it is a backport of 190206, 190330, 192537, 192540, 192584 and
192933.  I looked over all of them and none have the offending snippet:

#ifndef LRO_SUPPORTED
#ifdef IFCAP_LRO
#undef IFCAP_LRO
#endif
#define IFCAP_LRO 0x0
#endif

cxgb had LRO support on releng/7.1 and now it does not, since
LRO_SUPPORTED is not defined anywhere as a config option, or in the cxgb
Makefile.

Is this analysis correct?  Should the above lines be deleted from the
stable/7 repository?

Thanks,
matthew