sdk: keep $(STAGING_DIR)/usr/bin, at least curl needs it

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42397 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/sdk/Makefile

@@ -31,8 +31,7 @@ EXCLUDE_DIRS:=*/ccache \
 	*.install.clean \
 	*.install.flags \
 	*.install \
-	*/doc \
-	$(STAGING_SUBDIR_TARGET)/usr/bin
+	*/doc
 
 SDK_DIRS = \
 		$(STAGING_SUBDIR_HOST) \