patch 8.0.1312: balloon_show() only works in terminal when compiled with GUI

Problem:    balloon_show() only works in terminal when compiled with the GUI.
Solution:   Add FEAT_BEVAL_GUI and refactor to move common code out of the GUI
            specific file.
diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index 30a52f4..9c885b9 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -683,10 +683,11 @@
 
 INCL =	vim.h alloc.h arabic.h ascii.h ex_cmds.h farsi.h feature.h globals.h \
 	keymap.h macros.h option.h os_dos.h os_win32.h proto.h regexp.h \
-	spell.h structs.h term.h $(NBDEBUG_INCL)
+	spell.h structs.h term.h beval.h $(NBDEBUG_INCL)
 
 OBJ = \
 	$(OUTDIR)\arabic.obj \
+	$(OUTDIR)\beval.obj \
 	$(OUTDIR)\blowfish.obj \
 	$(OUTDIR)\buffer.obj \
 	$(OUTDIR)\charset.obj \
@@ -781,8 +782,7 @@
 RCFLAGS = $(RCFLAGS) -DFEAT_GUI_W32
 VIM = g$(VIM)
 GUI_INCL = \
-	gui.h \
-	gui_beval.h
+	gui.h
 GUI_OBJ = \
 	$(OUTDIR)\gui.obj \
 	$(OUTDIR)\gui_beval.obj \
@@ -1297,6 +1297,8 @@
 
 $(OUTDIR)/arabic.obj:	$(OUTDIR) arabic.c  $(INCL)
 
+$(OUTDIR)/beval.obj:	$(OUTDIR) beval.c  $(INCL)
+
 $(OUTDIR)/blowfish.obj:	$(OUTDIR) blowfish.c  $(INCL)
 
 $(OUTDIR)/buffer.obj:	$(OUTDIR) buffer.c  $(INCL)