[PATCH] OPW 2013: Build System Gtest Addition

Part of my 2013 OPW Project for Subversion is to add the Googletest
test suite to be compiled by the build system.

Googletests's pages can be found here:
    http://code.google.com/p/googletest/

There are 3 attachments: the patch, the log and a screen capture of the
build system output.

Known problems:

1. Currently there is no option provided to make compilation of Gtest
optional. The code in /trunk/build/ac-macros/gtest.m4 suggests that
there should be provision for this, but I could not get it to work.

2. Some headers are not found during the execution of autogen.sh --
this may be a Gtest internal issue:

WARNING: "gtest/internal/gtest-port.h" header not found, file
gtest/src/gtest-internal-inl.h
WARNING: "gtest/gtest.h" header not found, file
gtest/src/gtest-internal-inl.h
WARNING: "gtest/gtest-spi.h" header not found, file
gtest/src/gtest-internal-inl.h

Other issues:

1. I have not tested whether Gtest works correctly.

2. I have not tested whether svn works correctly.