patch 8.1.2081: the spell.c file is too big

Problem:    The spell.c file is too big.
Solution:   Move the code for spell suggestions to a separate file. (Yegappan
            Lakshmanan, closes #4988)
diff --git a/src/Make_cyg_ming.mak b/src/Make_cyg_ming.mak
index 3bc57aa..521ec3a 100644
--- a/src/Make_cyg_ming.mak
+++ b/src/Make_cyg_ming.mak
@@ -778,6 +778,7 @@
 	$(OUTDIR)/sign.o \
 	$(OUTDIR)/spell.o \
 	$(OUTDIR)/spellfile.o \
+	$(OUTDIR)/spellsuggest.o \
 	$(OUTDIR)/syntax.o \
 	$(OUTDIR)/tag.o \
 	$(OUTDIR)/term.o \