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_mvc.mak b/src/Make_mvc.mak
index 30f8175..42b6f8d 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -743,6 +743,7 @@
 	$(OUTDIR)\fileio.obj \
 	$(OUTDIR)\filepath.obj \
 	$(OUTDIR)\findfile.obj \
+	$(OUTDIR)\float.obj \
 	$(OUTDIR)\fold.obj \
 	$(OUTDIR)\getchar.obj \
 	$(OUTDIR)\gui_xim.obj \
@@ -1599,6 +1600,8 @@
 
 $(OUTDIR)/findfile.obj:	$(OUTDIR) findfile.c  $(INCL)
 
+$(OUTDIR)/float.obj:	$(OUTDIR) float.c  $(INCL)
+
 $(OUTDIR)/fold.obj:	$(OUTDIR) fold.c  $(INCL)
 
 $(OUTDIR)/getchar.obj:	$(OUTDIR) getchar.c  $(INCL)
@@ -1935,6 +1938,7 @@
 	proto/fileio.pro \
 	proto/filepath.pro \
 	proto/findfile.pro \
+	proto/float.pro \
 	proto/getchar.pro \
 	proto/gui_xim.pro \
 	proto/hardcopy.pro \