Building Instructions on the ApacheMQ-CPP Website.

The web page on building ApacheMQ-Cpp @
https://activemq.apache.org/cms/building.html does not contain any actual
instructions on how to build the library. Someone should modify it to
include the actual commands that need to be executed to build the library. I
have managed to figure out what the commands are, but other users might not
be able to.

What is there looks like this:
You may see the following warnings when running this command:

src/test-integration/Makefile.am:44: `CXXFLAGS' is a user variable, you
should not override it;
src/test-integration/Makefile.am:44: use `AM_CXXFLAGS' instead.
src/test/Makefile.am:104: `CXXFLAGS' is a user variable, you should not
override it;
src/test/Makefile.am:104: use `AM_CXXFLAGS' instead.

These can be ignored. We override CXXFLAGS in the makefiles for the unit and
integration tests in order to suppress compiler warnings.

Please notice that it does not say what the command to be executed is...