build: fix FDELT_TYPE configure check
build: fix FDELT_TYPE configure check

This probably never worked properly. Confirmed working now with every compiler
I throw at it.

Rebased-From: 8021cf8

domob1812/crowncoin,domob1812/crowncoin,domob1812/crowncoin,Crowndev/crowncoin,Crowndev/crowncoin,Infernoman/crowncoin,domob1812/crowncoin,domob1812/crowncoin,Infernoman/crowncoin,Infernoman/crowncoin,Crowndev/crowncoin,domob1812/crowncoin,Crowndev/crowncoin,Infernoman/crowncoin,Infernoman/crowncoin,Crowndev/crowncoin,Crowndev/crowncoin,Infernoman/crowncoin