Do not sort after subtraction.

This allows labels/strings to remain in their original order.

Test: go test bazel tests
Change-Id: I69f575df9e4a358fee4392ae48edf4550e463efb

bp2build/cc_object_conversion_test.go

@@ -439,13 +439,13 @@ func TestCcObjectSelectOnLinuxAndBionicArchs(t *testing.T) {
     copts = ["-fno-addrsig"],
     srcs = ["base.cpp"] + select({
         "//build/bazel/platforms/os_arch:android_arm64": [
-            "bionic_arm64.cpp",
             "linux_arm64.cpp",
+            "bionic_arm64.cpp",
         ],
         "//build/bazel/platforms/os_arch:android_x86": ["linux_x86.cpp"],
         "//build/bazel/platforms/os_arch:linux_bionic_arm64": [
-            "bionic_arm64.cpp",
             "linux_arm64.cpp",
+            "bionic_arm64.cpp",
         ],
         "//build/bazel/platforms/os_arch:linux_glibc_x86": ["linux_x86.cpp"],
         "//build/bazel/platforms/os_arch:linux_musl_x86": ["linux_x86.cpp"],