Merge branch 'globalsyms' into 'master'

.gitignore

src/header/dl-tls/mod.rs

src/header/dlfcn/mod.rs

src/header/stdio/scanf.rs

src/ld_so/callbacks.rs

src/ld_so/dso.rs

src/ld_so/library.rs

src/ld_so/linker.rs

src/ld_so/mod.rs

src/ld_so/start.rs

src/ld_so/tcb.rs

src/macros.rs

src/sync/semaphore.rs

tests/Makefile

tests/futimens.c

tests/stdio/scanf.c