tools: fix mtools/dosfstools related build system warnings

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 42442

tools/Makefile

@@ -33,9 +33,8 @@ tools-$(CONFIG_TARGET_orion_generic) += wrt350nv2-builder upslug2
 tools-$(CONFIG_powerpc) += upx
 tools-$(CONFIG_TARGET_x86) += qemu
 tools-$(CONFIG_TARGET_mxs) += elftosb
-tools-$(CONFIG_TARGET_brcm2708) += mtools dosfstools
+tools-$(CONFIG_TARGET_brcm2708)$(CONFIG_TARGET_sunxi) += mtools dosfstools
 tools-$(CONFIG_TARGET_ar71xx) += lzma-old squashfs
-tools-$(CONFIG_TARGET_sunxi) += mtools dosfstools
 tools-y += lzma squashfs4
 tools-$(BUILD_B43_TOOLS) += b43-tools
 tools-$(BUILD_PPL_CLOOG) += ppl cloog