Merge branch 'strict_tests' into 'master'

src/header/bits_pthread/cbindgen.toml

src/header/signal/mod.rs

tests/Makefile

tests/ctype.c

tests/errno.c

tests/futimens.c

tests/grp/getgrgid_r.c

tests/grp/getgrnam_r.c

tests/grp/gr_iter.c

tests/libgen.c

tests/pthread/cleanup.c

tests/pthread/extjoin.c

tests/pthread/main.c

tests/ptrace.c

tests/pwd.c

tests/signal.c

tests/stdio/fread.c

tests/stdio/freopen.c

tests/stdio/getline.c

tests/stdlib/alloc.c