patch 8.1.1687: the evalfunc.c file is too big

Problem:    The evalfunc.c file is too big.
Solution:   Move testing support to a separate file.
diff --git a/src/Make_vms.mms b/src/Make_vms.mms
index b7063e1..2b1d5c6 100644
--- a/src/Make_vms.mms
+++ b/src/Make_vms.mms
@@ -2,7 +2,7 @@
 # Makefile for Vim on OpenVMS
 #
 # Maintainer:   Zoltan Arpadffy <arpadffy@polarhome.com>
-# Last change:  2019 May 24
+# Last change:  2019 Jul 14
 #
 # This has script been tested on VMS 6.2 to 8.2 on DEC Alpha, VAX and IA64
 # with MMS and MMK
@@ -315,7 +315,7 @@
 	menu.c mbyte.c memfile.c memline.c message.c misc1.c misc2.c move.c \
 	normal.c ops.c option.c popupmnu.c popupwin.c profiler.c quickfix.c \
 	regexp.c search.c sha256.c sign.c spell.c spellfile.c syntax.c tag.c \
-	term.c termlib.c textprop.c ui.c undo.c usercmd.c userfunc.c \
+	term.c termlib.c testing.c textprop.c ui.c undo.c usercmd.c userfunc.c \
 	version.c screen.c window.c os_unix.c os_vms.c pathdef.c \
 	$(GUI_SRC) $(PERL_SRC) $(PYTHON_SRC) $(TCL_SRC) \
  	$(RUBY_SRC) $(HANGULIN_SRC) $(MZSCH_SRC) $(XDIFF_SRC)
@@ -330,7 +330,7 @@
 	move.obj mbyte.obj normal.obj ops.obj option.obj popupmnu.obj \
 	popupwin.obj profiler.obj quickfix.obj regexp.obj search.obj \
 	sha256.obj sign.obj spell.obj spellfile.obj syntax.obj tag.obj \
-	term.obj termlib.obj textprop.obj ui.obj undo.obj usercmd.obj \
+	term.obj termlib.obj testing.obj textprop.obj ui.obj undo.obj usercmd.obj \
 	userfunc.obj screen.obj version.obj window.obj os_unix.obj os_vms.obj \
 	pathdef.obj if_mzsch.obj \
 	$(GUI_OBJ) $(PERL_OBJ) $(PYTHON_OBJ) $(TCL_OBJ) \
@@ -745,6 +745,10 @@
  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 globals.h \
 
+testing.obj : testing.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 globals.h \
+
 textprop.obj : textprop.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 globals.h \