patch 8.1.0579: cannot attach properties to text

Problem:    Cannot attach properties to text.
Solution:   First part of adding text properties.
diff --git a/src/Make_cyg_ming.mak b/src/Make_cyg_ming.mak
index 1f62d86..79bff50 100644
--- a/src/Make_cyg_ming.mak
+++ b/src/Make_cyg_ming.mak
@@ -751,6 +751,7 @@
 	$(OUTDIR)/syntax.o \
 	$(OUTDIR)/tag.o \
 	$(OUTDIR)/term.o \
+	$(OUTDIR)/textprop.o \
 	$(OUTDIR)/ui.o \
 	$(OUTDIR)/undo.o \
 	$(OUTDIR)/userfunc.o \
@@ -1090,6 +1091,9 @@
 $(OUTDIR)/terminal.o:	terminal.c $(INCL) $(TERM_DEPS)
 	$(CC) -c $(CFLAGS) terminal.c -o $(OUTDIR)/terminal.o
 
+$(OUTDIR)/textprop.o:	textprop.c $(INCL)
+	$(CC) -c $(CFLAGS) textprop.c -o $(OUTDIR)/textprop.o
+
 
 CCCTERM = $(CC) -c $(CFLAGS) -Ilibvterm/include -DINLINE="" \
 	  -DVSNPRINTF=vim_vsnprintf \