mips: determine page size at runtime

mips: determine page size at runtime

Instead of passing an option to the configure script, use runtime detection
of the page size. Remove the "--with-pagesize" parameter from the configure
script.
Also accept 8k and 32k as valid page sizes.

Patch by Maran Pakkirisamy

It fixes BZ#342356.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15813