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Reported as a spack issue with gcc 10.2.0

Failure with

lemon: lemon.c:5139: SetAdd: Assertion `e>=0 && e<size' failed.

This really should not happen and haven't seen it happen elsewhere.

Possible remedy would be to drop the optimization level for C sources in the wmake toolchain, which now only include lemon.

For example, in the wmake/src/Makefile:

# Locally set optimized compilation
WM_COMPILE_OPTION = Opt

GENERAL_RULES   = $(WM_DIR)/rules/General
include $(GENERAL_RULES)/general

# Override -O3 with something less aggressive?
cOPT        = -O2

Could even drop this down further since it only affects this one tool and does not affect OpenFOAM or the speed of the generated code.