RTEMS | confdefs.h fails to compile when included in C++20 source (#5145)

[Lucian Silistru (@lsilistr)]

Lucian Silistru created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5145



## Summary
When trying to compile RTEMS samples with C++20 (cxxflags: -std=c++20), iostream fails to build with the following errors:
[iostream_build_log.txt](/uploads/8f6e8e770175652463d188bdeaa44903/iostream_build_log.txt)

This config uses gcc 13.3.0 for riscv but I have noticed it on gcc 12.1.0 for sparc also.

## Steps to reproduce

0. This can be reproduced with current HEADs of rtems/rsb:

`https://gitlab.rtems.org/rtems/rtos/rtems
c4625d8d86be1497c62ceca26a96fba2bc32c03a`

`https://gitlab.rtems.org/rtems/tools/rtems-source-builder
d82e3f433ba1441dc97e9d3c78eb0eb93212ed16`

1. Build tools

`../source-builder/sb-set-builder --prefix=/home/lsilistr/work/rtems-source-builder/build 6/rtems-riscv`

2. then clone rtems, create this basic config.ini and build:

`[riscv/rv64imafdc]

RTEMS_SMP = True

RTEMS_POSIX_API = True

BSP_RESET_BOARD_AT_EXIT = 0
`

`./waf configure --prefix=/home/lsilistr/work/rtems-source-builder/build/`
`./waf`

3. Modify testsuites/samples/iostream with the following patch:
[iostream.yml.patch](/uploads/08bf6b8edca73e9129bd0fddd9fcb698/iostream.yml.patch)

4. Rebuild.

## Expected behaviour

Sample compiles with no errors.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5145
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