Fix regex-emacs debug format glitches

Fix regex-emacs debug format glitches

These patches affect behavior only if REGEX_EMACS_DEBUG.
* src/regex-emacs.c (debug_putchar): Use unsigned for %x.
(print_compiled_pattern, ENSURE_FAIL_STACK, PUSH_FAILURE_POINT)
(POP_FAILURE_POINT): Use %td for ptrdiff_t.
(print_compiled_pattern, regex_compile, re_match_2_internal):
Put newlines at ends of lines, not at starts of next lines.
Omit white space at line ends.