Fix to allow UEFI for operating-system

Ignore uefi files if Linux; ignore linux files if uefi

Pull in new M2libc.

Bump M2-Mesoplanet version to 1.11.0.

Make --no-includes function how most people would expect it

Fix macro processing when they have brackets.

Fix a missing long --operating-system argument.

Build POSIX rather than native binaries by default.

Merge remote-tracking branch 'stikonas/uefi_spawning'

More sanity checking on input

Add --os argument to allow building UEFI binaries.

Add support for spawning in UEFI.

Support -D flags

Add support for #warning

enable disabling of reading #includes

Enable more temp directory flexiblity

Allow M2-Mesoplanet to work on systems without /tmp

such as live-bootstrap

get a subset of the arguments processed before setting up environment

Merge branch 'main' of github.com:oriansj/M2-Mesoplanet

A much less wasteful envp setup