(From: gkodinov)
Use and int * where possible to scan for trailing space in a
string instead of always iterating char-by-char.
Using the attached benchmark file on a 32 bit Intel Core 2 
Duo CPU I've got 43485 ms run with the fix compared to 44373 
without it.

Backported to 5.6.0 (next-mr-runtime)
6.0-codebase revid: 2476.1362.1


include/m_string.h:
  scan for space through ints
strings/ctype-bin.c:
  scan for space through ints
strings/ctype-latin1.c:
  scan for space through ints
strings/ctype-mb.c:
  scan for space through ints
strings/ctype-simple.c:
  scan for space through ints