Add APR 1.4.x to list of acceptable version to build UIMA C++

Reported by Jean-Cedric Chappelier

I just tested the very last version (2.4.0.03 from Jan 25th,
downloaded from here:
http://people.apache.org/~bhavani/uimacpp-release-candidates/2.4.0/03/uimacpp-2.4.0-src.tgz
), and have a few remarks, hopefully helpful.

I tested it on a Ubuntu 11.04 with all up-to-date packages but
without ActiveMQ.

1) my first remark is why do you restrict APR to 1.3?
I edited APR_VER_REGEXES in configure.ac to include also 1\.4\.[0-9]
(mine is 1.4.2) and everything seems to work gracefully.