Merge the final components for Aarch64 support into master.

implement setid functions and unlink

Preliminary implementation of strtol()

correction to include guard of stat

Aarch64: Update syscall usage

Dan Robertson authored 7 years ago and Dan Robertson committed 7 years ago

Don't use syscalls that are non-existent on Aarch64 linux boxes. The
FORK and RMDIR syscalls are no longer present and the CLONE and UNLINKAT
syscalls are used instead.

Imp va_arg for fcntl; fcntl test

Implement atof

fcntl: open should use a va_list

Implement fcntl

The current implementation of open requires the user to pass all three
args to the function. It should use a va_list and allow a user to
provide only the filename and flags.

No tests written yet! See #36

string: fix out of bounds bug in strncmp

Add build badge to README

ctype: tests and reorganize

Wrote tests for the functions implemented in 40558b26 and maybe made that
test a little more comprehensible.

Also made sure that fmt.sh and test.sh were being executed by bash all
the time (compatibility with other shells).