Fixed Lua header file checks for builds on Alpine Linux.
Fixed Lua header file checks for builds on Alpine Linux.

With kudos to @mikegogulski who figured this out.

conreality/consensus,conreality/consensus,conreality/conreality,conreality/consensus,conreality/conreality,conreality/conreality,conreality/consensus,conreality/conreality,conreality/conreality