message: add missing definition of the fortran compiler
diff: @@ -9,6 +9,7 @@ CROSSCOMPREFIX = x86_64-hermit-
  CC_FOR_TARGET = $(CROSSCOMPREFIX)gcc
  GO_FOR_TARGET = $(CROSSCOMPREFIX)gccgo
  +FC_FOR_TARGET = $(CROSSCOMPREFIX)gfortran
  CXX_FOR_TARGET = $(CROSSCOMPREFIX)g++
  GCC_FOR_TARGET = $(CROSSCOMPREFIX)gcc
  CPP_FOR_TARGET = $(CROSSCOMPREFIX)cpp
  