Up to now, the version numbers were defined in configure.ac and put
into gd.h by generating it from gd.h.in, replacing the values of
several C macros. This violates the DRY principle, won't work on a
dumb build system, confuses some dev tools and is just a huge headache
in general.
This change makes gd.h (no longer generated) the home of the version
number and provides a script (config/getver.pl) which can extract the
requested version components from the header file. configure.ac now
gets the version number from gd.h instead of vice versa.
In addition, there are now C functions that return the values of the
version macros. This is for the benefit of non-C code using the
library without access to the header file. It also provides a way to
get the version number of the library currently linked rather than the
header the program was compiled against. (This could change if the
shared library is updated without recompiling the program using it.)
Christoph M. Becker
Chris Reuter