[gcc r14-7867] gccrs: Add missing CHECKING_P guard to rust-unicode.cc

[Arthur Cohen]

https://gcc.gnu.org/g:884dec3a424e3e79148bfc29a6c48d6d81ae08ce

commit r14-7867-g884dec3a424e3e79148bfc29a6c48d6d81ae08ce
Author: Owen Avery <powerboat9.gamer@gmail.com>
Date:   Sun Jul 30 00:23:00 2023 -0400

    gccrs: 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 <powerboat9.gamer@gmail.com>

Diff:
---
 gcc/rust/util/rust-unicode.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gcc/rust/util/rust-unicode.cc b/gcc/rust/util/rust-unicode.cc
index 7f22936eed5..738e1f162eb 100644
--- a/gcc/rust/util/rust-unicode.cc
+++ b/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