elf2flt: allow older binutils to be used

toolchain/elf2flt/Makefile

@@ -30,6 +30,14 @@ ifeq ($(ADK_TOOLCHAIN_BINUTILS_2_39),y)
 BINUTILS_VERSION:=	2.39
 BFDLIB:=		libbfd.a
 endif
+ifeq ($(ADK_TOOLCHAIN_BINUTILS_2_38),y)
+BINUTILS_VERSION:=	2.38
+BFDLIB:=		libbfd.a
+endif
+ifeq ($(ADK_TOOLCHAIN_BINUTILS_2_37),y)
+BINUTILS_VERSION:=	2.37
+BFDLIB:=		libbfd.a
+endif
 ifeq ($(ADK_TOOLCHAIN_BINUTILS_2_28),y)
 BINUTILS_VERSION:=	2.28
 BFDLIB:=		libbfd.a