sdk: add missing change from r3328-f55c29e4c7

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

target/sdk/Makefile

@@ -18,7 +18,7 @@ SDK_BUILD_DIR:=$(BUILD_DIR)/$(SDK_NAME)
 
 STAGING_SUBDIR_HOST := staging_dir/host
 STAGING_SUBDIR_TARGET := staging_dir/$(TARGET_DIR_NAME)
-STAGING_SUBDIR_TOOLCHAIN := staging_dir/toolchain-$(ARCH)$(ARCH_SUFFIX)_gcc-$(GCCV)_$(LIBC)-$(LIBCV)$(if $(CONFIG_arm),_eabi)
+STAGING_SUBDIR_TOOLCHAIN := staging_dir/toolchain-$(ARCH)$(ARCH_SUFFIX)_gcc-$(GCCV)_$(LIBC)$(if $(CONFIG_arm),_eabi)
 
 EXCLUDE_DIRS:=*/ccache/* \
 	*/stamp \