patch 8.2.2928: the evalfunc.c file is too big

Problem:    The evalfunc.c file is too big.
Solution:   Move float related functionality to a separate file. (Yegappan
            Lakshmanan, closes #8287)
diff --git a/src/Make_vms.mms b/src/Make_vms.mms
index 3631236..4928b0b 100644
--- a/src/Make_vms.mms
+++ b/src/Make_vms.mms
@@ -343,6 +343,7 @@
 	fileio.c \
 	filepath.c, \
 	findfile.c \
+	float.c \
 	fold.c \
 	getchar.c \
 	gui_xim.c \
@@ -460,6 +461,7 @@
 	fileio.obj \
 	filepath.obj \
 	findfile.obj \
+	float.obj \
 	fold.obj \
 	getchar.obj \
 	gui_xim.obj \
@@ -860,6 +862,9 @@
  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
+float.obj : float.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
 fold.obj : fold.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