rust: rename .cargo/config to .cargo/config.toml

Addresses this warning from the Rust compiler:

warning: `../rust/.cargo/config` is deprecated in favor of `config.toml`
note: if you need to support cargo 1.38 or earlier, you can symlink `config` to `config.toml`
(cherry picked from commit 8560564657)

configure.ac

@@ -2642,7 +2642,7 @@ AC_SUBST(enable_non_bundled_htp)
 
 AM_CONDITIONAL([BUILD_SHARED_LIBRARY], [test "x$enable_shared" = "xyes"] && [test "x$can_build_shared_library" = "xyes"])
 
-AC_CONFIG_FILES(Makefile src/Makefile rust/Makefile rust/Cargo.lock rust/Cargo.toml rust/derive/Cargo.toml rust/.cargo/config)
+AC_CONFIG_FILES(Makefile src/Makefile rust/Makefile rust/Cargo.lock rust/Cargo.toml rust/derive/Cargo.toml rust/.cargo/config.toml)
 AC_CONFIG_FILES(qa/Makefile qa/coccinelle/Makefile)
 AC_CONFIG_FILES(rules/Makefile doc/Makefile doc/userguide/Makefile)
 AC_CONFIG_FILES(contrib/Makefile contrib/file_processor/Makefile contrib/file_processor/Action/Makefile contrib/file_processor/Processor/Makefile)

rust/.gitignore

@@ -1,7 +1,8 @@
 !Cargo.toml.in
 !Cargo.lock.in
 Cargo.toml
-/.cargo/config
+/.cargo/config.toml
+!/.cargo/config.toml.in
 /Cargo.lock
 /target
 /vendor

rust/Makefile.am

@@ -1,5 +1,5 @@
 EXTRA_DIST =	src derive \
-		.cargo/config.in \
+		.cargo/config.toml.in \
 		cbindgen.toml \
 		dist/rust-bindings.h \
 		vendor