toolchain/gcc: add elf2flt to dependencies

Add host-elf2flt to the gcc common dependencies so we get it built after
binutils but before gcc/uclibc since it's required for all packages and
in some uClibc configuration scenarios.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/gcc/gcc.mk

@@ -86,7 +86,8 @@ endef
 HOST_GCC_COMMON_DEPENDENCIES = \
 	host-binutils \
 	host-gmp \
-	host-mpfr
+	host-mpfr \
+	$(if $(BR2_BINFMT_FLAT),host-elf2flt)
 
 HOST_GCC_COMMON_CONF_OPT = \
 	--target=$(GNU_TARGET_NAME) \