add i486 processor ARCH detection

Make.inc

@@ -46,15 +46,17 @@ clean:
 ifeq ($(ARCH),i386)
 override ARCH := i387
 endif
+ifeq ($(ARCH),i486)
+override ARCH := i387
+endif
+ifeq ($(ARCH),i686)
+override ARCH := i387
+endif
 
 ifeq ($(ARCH),x86_64)
 override ARCH := amd64
 endif 
 
-ifeq ($(ARCH),i686)
-override ARCH := i387
-endif
-
 ifneq (,$(findstring MINGW,$(OS)))
 override OS=WINNT
 endif