start: make stack size strategy configurable

[Aransentin]

With this PR, one can specify what Linux stack-resizing behaviour by setting the appropriate option in std_options. There are three possibilities:

• none, which relies on the default Linux stack size of 8 MiB.
• program_header, which will look through the ELF headers set the stack size using setrlimit. This is the current and default behaviour.
• fixed, which sets the value to a configurable fixed size, compile-time asserted to be divisible by the page size as the syscall wants.

If you don't set any of these values the default of program_header is chosen, which is the current behaviour, so this PR should have no effect on existing code.

[andrewrk]

Closing abandoned pull request (CI checks failing, no activity in 30 days).