(bug 38249) No PCRE unicode causes installer to spew giberish

(bug 38249) No PCRE unicode causes installer to spew giberish

If PHP's PCRE is not compiled with unicode property support, this causes
the regexes used by the parser to not compile, causing the parser to
output giberish. Its been reported that the default PHP package for
cent os has PCRE in such a config.

As a result the installer will output total giberish. The user has
no idea what went wrong because there is no meaningful output.

To counter that, cause Parser to throw an exception in that case.
It seemed easier than figuring out how to convince the installer
not to parse the environment check. For completeness sake though
I fixed the PCRE environment check to adequetely check for PCRE
not having unicode support.

This should be backported to 1.19 since there are quite a few
complaints about the issue on project:Support_desk. /me has
no idea what the procedure for that is in our new git world

Change-Id: Idb1658be4ee6203a55740450e335f570a616671c