Adds ssdeep support in our build system

ssdeep will be used with the @fuzzyHash operator which is under
development
Adds fuzzyHash operator

The fuzzyHash operator can be used to match files. In conjuntcion
with FILES_TMP_CONTENT collection it can scan uploaded files and
try to match it with a pre caculated list of know malicious content,
more details on how it works can be found on ssdeep website:
http://ssdeep.sourceforge.net/
iis: Adds ssdeep support
Adds regression test to cover the @fuzzeHash operator

Added 30-fuzzyHash.t and the ssdeep hash files. Hash files was generated using
files from ModSecurity repository.
FuzzyHash: if disable giving an run time error instead of config

FuzzyHash operator is optional and only installed if the headers for libfuzzy
was found in the system. Otherwise, the FuzzyHash operator is disable during
the compilation. After this commit, if some rules tries to use it, ModSecurity
will produce an runtime error not a config time error, allowing the web server
to procede normal with its operations.
Declares msre_var *rvar at the beggining of the function

Necessary to fix the build on Win8 VS 2011
Temporarily disable a test that is leading nginx buildbot to fail.