Rollup merge of #138972 - thaliaarchi:nuttx-build, r=Mark-Simulacrum

std: Fix build for NuttX targets

Fix std build for all NuttX targets. It is the single largest set of failures on <https://does-it-build.noratrieb.dev/>. Although, ESP-IDF also requires these same gates, there are other issues for those targets.

This can verified be running `x check library/std --target=` for all NuttX targets.

cc ``@no1wudi``

Author: ChrisDenton