Add missing CHECKING_P guard to rust-unicode.cc

gcc/rust/ChangeLog:

	* util/rust-unicode.cc: Add CHECKING_P guard.

Signed-off-by: Owen Avery <[email protected]>

Author: powerboat9

gcc/rust/util/rust-unicode.cc

@@ -239,6 +239,8 @@ is_numeric (uint32_t codepoint)
 
 } // namespace Rust
 
+#if CHECKING_P
+
 namespace selftest {
 
 void
@@ -326,3 +328,5 @@ rust_utf8_property_test ()
 }
 
 } // namespace selftest
+
+#endif // CHECKING_P