replace llabs with imaxabs

both are gcc built-in but imaxabs doesn't require C99 compat (see man)
make array/object APIs accept large strings as values of elements/props
fixed strip_tags() and hebrev() to work with big strings
fixed trim() and strtok() to work with big strings
skip this if we can't check the uid
Special-case aliases, add warning comments to implementations
Merge branch 'master' of git://github.com/php/php-src