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_vms.mms b/src/Make_vms.mms
index 3f65201..9dde761 100644
--- a/src/Make_vms.mms
+++ b/src/Make_vms.mms
@@ -306,6 +306,7 @@
 	   $(PERL_LIB) $(PYTHON_LIB) $(TCL_LIB) $(RUBY_LIB) $(LUA_LIB)
 
 SRC = \
+	alloc.c \
 	arabic.c \
 	arglist.c \
 	autocmd.c \
@@ -425,6 +426,7 @@
 	$(XDIFF_SRC)
 
 OBJ = \
+	alloc.obj \
 	arabic.obj \
 	arglist.obj \
 	autocmd.obj \
@@ -738,6 +740,9 @@
 	-@ !
 .ENDIF
 
+alloc.obj : alloc.c vim.h [.auto]config.h feature.h os_unix.h \
+ ascii.h keymap.h term.h macros.h structs.h regexp.h gui.h beval.h \
+ [.proto]gui_beval.pro option.h ex_cmds.h proto.h errors.h globals.h
 arabic.obj : arabic.c vim.h
 arglist.obj : arglist.c vim.h [.auto]config.h feature.h os_unix.h
 autocmd.obj : autocmd.c vim.h [.auto]config.h feature.h os_unix.h