Clean up some warnings from cppcheck
Clean up some warnings from cppcheck

When using cppcheck with acutest there are some warnings that it flags.
These are all minor, but it would be nice to not have them show up.
The following are the ones addressed here:

[include/acutest.h:560]: (warning) %u in format string (no. 2) requires 'unsigned int' but the argument type is 'signed int'.
[include/acutest.h:831]: (style) The scope of the variable 'starts_on_word_boundary' can be reduced.
[include/acutest.h:832]: (style) The scope of the variable 'ends_on_word_boundary' can be reduced.
[include/acutest.h:895]: (style) The scope of the variable 'args' can be reduced.

mity/acutest,mity/cutest