crt0

Part of the Magisk project.

An extremely rudimentary libc with its sole purpose being to build the smallest possible executable for Magisk.
A lot of code in this project is modified from various sources.

• bionic: https://android.googlesource.com/platform/bionic.git/+/refs/heads/main/libc/
• musl: https://musl.libc.org/
• tinystdio: https://github.com/vladcebo/TinyStdio
• linux_syscall_support.h: https://chromium.googlesource.com/linux-syscall-support
• Other copied functions have its source commented above its code