At the same time, change the library sonames for -3.0 to just -3.
This is necessary since the 2.99 releases installed libraries like
libgtk-3.0.so.0.9903.0, and we want to prevent the library version
number from jumping back. So 3.0 will have libgtk-3.so.0.0.0.
Commit 80e1340e introduced using a GDK method in examples/drawing.c, so
actually link that to GDK. Fixes build failure with --as-needed linker option
and gcc 4.5.
This commit does a number of things:
- remove some dead wchar configury from configure.ac and gdkconfig.h
- repurpose gdkconfig.h as header that contains GDK_WINDOWING_foo
macros for each included backend, include it in gdk.h and install
it in $includedir instead of below $libdir
- drop the backend from the library names
- build libgdk-3.0.la as a convenience lib and include it in libgtk-3.0.la
It does not yet enable building multiple backends at the same time.
We build the examples that are included in the 'getting started'
chapter of the docs to prevent them from bitrotting. Also
remove the awk scripts used to extract the old examples from
the tutorial, since the tutorial is gone. I'm still leaving
the examples themeselves in place, for possible inclusion in
'getting started' later on.
