Merge branch 'ps/sane-ctype-workaround'

Our <sane-ctype.h> header file relied on that the system-supplied <ctype.h> header is not later included, which would override our macro definitions, but "amazon linux" broke this assumption. Fix this by preemptively including <ctype.h> near the beginning of <sane-ctype.h> ourselves. * ps/sane-ctype-workaround: sane-ctype: fix compiler error on Amazon Linux 2