Fix be_visitor_map_cdr_op_ch

[tmayoff]

#2141 (comment).

For these errors: https://tao.microfocus.com/scoreboard/rhel7_x64_dev/2023_10_24_20_44_Full.html#error_1. Does the generated c++ need to use typedefs rather than using?

[mitza-oci]

(void) could be just () -- it's OK either way since existing code uses (void)

[mitza-oci]

For these errors: https://tao.microfocus.com/scoreboard/rhel7_x64_dev/2023_10_24_20_44_Full.html#error_1. Does the generated c++ need to use typedefs rather than using?

Yes, looks like that compiler doesn't have C++11 type aliases.

[jwillemsen]

Looks there are some more things left to cleanup

Error E2088 be_include\be_visitor_map/map_ch.h 33: Bad syntax for pure function definition
Error E2088 be_include\be_visitor_map/map_cs.h 35: Bad syntax for pure function definition
Error E2088 be_include\be_visitor_map/cdr_op_cs.h 32: Bad syntax for pure function definition