Merge branch 'gcc-regressions' into 'master'

include/sys/types.h

src/header/stdio/default.rs

src/header/stdio/helpers.rs

src/header/stdio/mod.rs

src/header/stdio/printf.rs

tests/Makefile

tests/expected/stdio/fscanf_offby1.stderr

tests/expected/stdio/fscanf_offby1.stdout

tests/expected/stdio/printf_neg_pad.stderr

tests/expected/stdio/printf_neg_pad.stdout

tests/expected/stdio/ungetc_ftell.stderr

tests/expected/stdio/ungetc_ftell.stdout

tests/expected/stdio/ungetc_multiple.stderr

tests/expected/stdio/ungetc_multiple.stdout

tests/stdio/fscanf_offby1.c

tests/stdio/printf_neg_pad.c

tests/stdio/ungetc_ftell.c

tests/stdio/ungetc_multiple.c