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Underlyingly, uses standard POSIX poll() for portability.

In new hardware API, these classes implement master modes of interfaces,
and "mode" parameter is not accepted. Trying to implement new HW API
in terms of older pyb module leaves variuos corner cases:

In new HW API, I2C(1) means "I2C #1 in master mode" (? depends on
interpretation), while in old API, it means "I2C #1, with no settings
changes".

For I2C class, it's easy to make mode optional, because that's last
positional param, but for SPI, there's "baudrate" after it (which
is inconsistent with I2C, which requires "baudrate" to be kwonly-arg).

This fixes the build after changes in [66fd3e4a] and [3a6b3d23]

Removes FFI dependency, instead uses builtin os module. Thus can work on
systems where dynamic library loading is not available.

Dependency of upip.

Dependency of upip.

This also unbreaks "make minimal".

It's safer to define it where it's used, defining it for all source files
may lead to hard to diagnose conflicts in corner cases.

MICROPY_PERSISTENT_CODE must be enabled, and then enabling
MICROPY_PERSISTENT_CODE_LOAD/SAVE (either or both) will allow loading
and/or saving of code (at the moment just bytecode) from/to a .mpy file.

Main changes when MICROPY_PERSISTENT_CODE is enabled are:

- qstrs are encoded as 2-byte fixed width in the bytecode
- all pointers are removed from bytecode and put in const_table (this
  includes const objects and raw code pointers)

Ultimately this option will enable persistence for not just bytecode but
also native code.

Contains just argument names at the moment but makes it easy to add
arbitrary constants.

Less dependencies.

This file contains various MicroPython-specific helper functions, so isn't
good fit for lib/libc/.

This defaults to 'python' but can be now overridden if needed

This makes select.poll() interface fully compatible with CpYthon. Also, make
their numeric values of these options compatible with Linux (and by extension,
with iBCS2 standard, which jopefully means compatibility with other Unices too).

Port specific settinigs defined in mpconfigport. FreeRTOS and semphr
headers added to define SemaphoreHandle_t for the SYNC_T.

Port specific settings defined in mpconfigport.