Clearify running testsuite as part of patch submission

[Andreas Jaeger]

Marek and myself just discussed about the testsuite on IRC and I've learned 
about the "xcheck" make target.

I suggest that the "running the testsuite with a patch" gets clarified as:
Run the whole testsuite with make "xcheck". Also, check-abi should be run 
in any case, thus you need to configure with --enable-check-abi.

So, I suggest that we add to the wiki page 
http://sourceware.org/glibc/wiki/Contribution%20checklist in section 
"Testing" something like:

Configure with --enable-check-abi and run the whole testsuite with "make 
xcheck".

Ok?

Andreas
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