target/sdk: Fix filename with external toolchain

When building SDK with external toolchain, don't
include _gcc in the filename

Signed-off-by: Daniel Dickinson <openwrt@daniel.thecshore.com>

SVN-Revision: 48084

target/sdk/Makefile

@@ -12,7 +12,7 @@ include $(INCLUDE_DIR)/version.mk
 
 override MAKEFLAGS=
 
-SDK_NAME:=$(VERSION_DIST)-SDK-$(if $(CONFIG_VERSION_FILENAMES),$(VERSION_NUMBER)-)$(BOARD)$(if $(SUBTARGET),-$(SUBTARGET))_gcc-$(GCCV)$(DIR_SUFFIX).$(HOST_OS)-$(HOST_ARCH)
+SDK_NAME:=$(VERSION_DIST)-SDK-$(if $(CONFIG_VERSION_FILENAMES),$(VERSION_NUMBER)-)$(BOARD)$(if $(SUBTARGET),-$(SUBTARGET))$(if $(GCCV),_gcc-$(GCCV))$(DIR_SUFFIX).$(HOST_OS)-$(HOST_ARCH)
 SDK_BUILD_DIR:=$(BUILD_DIR)/$(SDK_NAME)
 
 STAGING_SUBDIR_HOST := staging_dir/host