[gcc/devel/rust/master] Remove unused prototypes

[Thomas Schwinge]

https://gcc.gnu.org/g:d91796f90d437ed003cae88a7d9f8eb7a573f21b

commit d91796f90d437ed003cae88a7d9f8eb7a573f21b
Author: Philip Herron <philip.herron@embecosm.com>
Date:   Thu Aug 11 12:55:44 2022 +0100

    Remove unused prototypes

Diff:
---
 gcc/rust/rust-gcc.cc | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/gcc/rust/rust-gcc.cc b/gcc/rust/rust-gcc.cc
index f6c053465fb..66fd8bce84e 100644
--- a/gcc/rust/rust-gcc.cc
+++ b/gcc/rust/rust-gcc.cc
@@ -323,10 +323,6 @@ public:
   bool function_set_parameters (tree function,
 				const std::vector<Bvariable *> &);
 
-  tree lookup_gcc_builtin (const std::string &);
-
-  tree lookup_builtin_by_rust_name (const std::string &);
-
   void write_global_definitions (const std::vector<tree> &,
 				 const std::vector<tree> &,
 				 const std::vector<tree> &,