RTEMS Source Builder | Add C and C++ standard option support for packages (#176)

[Chris Johns (@chris)]

Chris Johns created an issue: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/issues/176

Assignee: Chris Johns

Some packages need a specific version of the C and C++ language to build. The compilers on hosts are pushing the default language to newer versions to improve the base code bas however RTEMS needs to be able to set a version so a release can sit on package version and have it build on newer host systems. This is important on release branches.

Add:

1. `host_c_std`
2. `host_cxx_std`
3. `build_c_std`
4. `build_cxx_std`

to `defaults.mc` as empty settings. A package can then set a standard with:

```
%define host_c_std c11
```

These macros can be expanded into the `SB_HOST_CFLAGS` and `SB_HOST_CXXFLAGS` in the `__build_pre` shell support using a `%{?host_c_std --std=%{host_c_std}}` pattern.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/issues/176
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