clang-tidy: Disable UndefinedBinaryOperatorResult check in src/ipc

The warnings are false positive and have been fixed upstream.
See: https://github.com/capnproto/capnproto/pull/2334.

This change disables the `UndefinedBinaryOperatorResult` clang-tidy
check for source files generated by the `mpgen` tool.

src/ipc/.clang-tidy.in

@@ -0,0 +1,3 @@
+Checks: '
+-clang-analyzer-core.UndefinedBinaryOperatorResult,
+'

src/ipc/CMakeLists.txt

@@ -21,3 +21,5 @@ target_link_libraries(bitcoin_ipc
     core_interface
     univalue
 )
+
+configure_file(.clang-tidy.in .clang-tidy USE_SOURCE_PERMISSIONS COPYONLY)