xdrgen: Emit the program number definition

"xdrgen definitions" was not providing a definition of a symbolic
constant for the RPC program number being defined.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

tools/net/sunrpc/xdrgen/generators/program.py

@@ -127,6 +127,9 @@ class XdrProgramGenerator(SourceGenerator):
         for version in node.versions:
             emit_version_definitions(self.environment, program, version)
 
+        template = self.environment.get_template("definition/program.j2")
+        print(template.render(name=raw_name, value=node.number))
+
     def emit_declaration(self, node: _RpcProgram) -> None:
         """Emit a declaration pair for each of an RPC programs's procedures"""
         raw_name = node.name

tools/net/sunrpc/xdrgen/templates/C/program/definition/program.j2

@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+#ifndef {{ name }}
+#define {{ name }} ({{ value }})
+#endif