Revert "Work around inline __asm__ occurrence in LHCb+COOL code."

This reverts commit f3d83f16579a52faaf365c40a0ab33f7c6055e58.
It caused failures due to unresolved symbols (boost::detail::spinlock_pool<1>::pool_).
Instead, for now, BOOST_SP_USE_SPINLOCK will need to be defined by the experiments / LCG for now.

Conflicts:
	core/meta/src/TCling.cxx