Revert "deal with opensuse cbindgen"

This reverts commit 483dbac.

.gitignore

@@ -55,4 +55,3 @@ cov*
 *libknet/bindings/rust/src/sys/libknet.rs
 *libnozzle/bindings/rust/src/sys/libnozzle.rs
 *build.rs
-build-aux/rust-regen.sh

build-aux/rust-regen.sh.in → build-aux/rust-regen.sh

@@ -15,7 +15,7 @@ srcheader="$1"
 dstrs="$2"
 filter="$3"
 
-@BINDGEN@ \
+bindgen \
 	--size_t-is-usize \
 	--no-recursive-whitelist \
 	--no-prepend-enum-name \

configure.ac

@@ -284,7 +284,7 @@ if test "x$enable_rust_bindings" = "xyes"; then
 		AC_MSG_ERROR(["rustc command not found"])
 	fi
 
-	AC_CHECK_PROGS([BINDGEN], [bindgen cbindgen], [no])
+	AC_PATH_PROG([BINDGEN], [bindgen], [no])
 	if test "x$BINDGEN" = xno; then
 		AC_MSG_ERROR(["bindgen command not found"])
 	fi
@@ -430,8 +430,6 @@ AS_IF([test -n "$SOURCE_EPOCH"],
 	])
 AC_MSG_NOTICE([using source epoch $($UTC_DATE_AT$SOURCE_EPOCH +'%F %T %Z')])
 
-AC_CONFIG_FILES([build-aux/rust-regen.sh], [chmod +x build-aux/rust-regen.sh])
-
 AC_CONFIG_FILES([
 		Makefile
 		libnozzle/Makefile