Currently, there is no WUtil.pc file so that WINGs developers can use
pkg-config to compile programs using the WINGs utility library. This patch
fixes this, and such a file is created by make, just like WINGs.pc and
wrlib.pc.
In addition, the WUtil.pc file has been added to .gitignore and included in
the debian libwings-dev package.
The previous rule was to ignore the whole directory, while still having
some files tracked inside.
Now we only explicitly ignore the files that have been placed there by the
autotools, so we can have a better view of it in Git when adding stuff.
Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
It helps to understand why a file is present in this file, which
in turn can help to understand where a file comes from and it makes
updates to the file easier
