Add .E suffix

Makerules

@@ -2,7 +2,7 @@
 # Licensed under LGPL v2.1, see the file COPYING.LIB in this tarball for details.
 #
 
-.SUFFIXES: .c .S .o .os .oS .so .a .s .i
+.SUFFIXES: .c .S .o .os .oS .so .a .s .i .E
 
 # order is important, the stripping uses STRIP_FLAGS for lib-so, but not for lib-a
 ifeq ($(HAVE_SHARED),y)