* Use ax_boost_base.m4 from autoconf-archive 2008-11-07
* Add ax_compare_version.m4
* Modify pkg-config.m4 to store version in pkg_package_version
* Build bundled locator.c for hamlib <= 1.2.8 or when it is not available
* Add -mfpmath=sse to compiler flags for --enable-optimizations=native
Simplify pkg-config.m4 and make sure that pkg-config
can be overridden by setting CFLAGS & LIBS variables.
Likewise for xmlrpc.m4. Also add static switches around
xmlrpc linker flags when --enable-static has been specified.