Declare support for gcc_quoting_for_param_files feature in Unix cc_…

…toolchain

This was missed with a9e5a32. Without this change, `gcc_quoting_for_param_files` does nothing, because `FeatureConfiguration.isEnabled()` will always return false. Without `gcc_quoting_for_param_files`, linking can fail for files with spaces in them.

Closes bazelbuild#21699.

PiperOrigin-RevId: 617092387
Change-Id: Ifcd4378d2120e2e75e2e72a4b0059b41ba5ce833

tools/cpp/unix_cc_toolchain_config.bzl

@@ -215,6 +215,11 @@ def _impl(ctx):
         enabled = True,
     )
 
+    gcc_quoting_for_param_files_feature = feature(
+        name = "gcc_quoting_for_param_files",
+        enabled = True,
+    )
+
     static_link_cpp_runtimes_feature = feature(
         name = "static_link_cpp_runtimes",
         enabled = False,
@@ -1396,6 +1401,7 @@ def _impl(ctx):
             asan_feature,
             tsan_feature,
             ubsan_feature,
+            gcc_quoting_for_param_files_feature,
             static_link_cpp_runtimes_feature,
         ] + (
             [
@@ -1436,6 +1442,7 @@ def _impl(ctx):
             asan_feature,
             tsan_feature,
             ubsan_feature,
+            gcc_quoting_for_param_files_feature,
             static_link_cpp_runtimes_feature,
         ] + (
             [