patch 8.2.3301: memory allocation functions don't have their own place

Problem:    Memory allocation functions don't have their own place.
Solution:   Move memory allocation functions to alloc.c.  (Yegappan
            Lakshmanan, closes #8717)
diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index 18b5a88..5d725cc 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -733,6 +733,7 @@
 	spell.h structs.h term.h beval.h $(NBDEBUG_INCL)
 
 OBJ = \
+	$(OUTDIR)\alloc.obj \
 	$(OUTDIR)\arabic.obj \
 	$(OUTDIR)\arglist.obj \
 	$(OUTDIR)\autocmd.obj \
@@ -1542,6 +1543,8 @@
 .cpp{$(OUTDIR)/}.obj::
 	$(CC) $(CFLAGS_OUTDIR) $<
 
+$(OUTDIR)/alloc.obj:	$(OUTDIR) alloc.c  $(INCL)
+
 $(OUTDIR)/arabic.obj:	$(OUTDIR) arabic.c  $(INCL)
 
 $(OUTDIR)/arglist.obj:	$(OUTDIR) arglist.c  $(INCL)
@@ -1932,6 +1935,7 @@
 
 # End Custom Build
 proto.h: \
+	proto/alloc.pro \
 	proto/arabic.pro \
 	proto/arglist.pro \
 	proto/autocmd.pro \