gn adaptation, Remove set_sources_assignment_filter function

Signed-off-by: Noumeng <oumeng@huawei.com>
Change-Id: Id49c3cb0013e1fc9c620cbad74c6fabcad4cb57a

musl_template.gni

@@ -271,7 +271,6 @@ template("musl_libs") {
   source_set("${abi_prefix}_musl_src") {
     sources_orig = []
     sources = []
-    set_sources_assignment_filter([])
 
     sources_orig = musl_src_arch_file + musl_src_file
     sources_orig -= musl_src_filterout

scripts/build_lite/BUILD.gn

@@ -100,7 +100,6 @@ action_foreach("strip") {
   no_default_deps = true
   deps = [ ":build_sysroot" ]
   script = "//build/lite/run_shell_cmd.py"
-  set_sources_assignment_filter([ "*.txt" ])
   sources = get_target_outputs(deps[0])
   outputs = [ "$root_out_dir/libs/{{source_file_part}}" ]
   args = [