It has been a request that multiple libnl versions should be installabe
in parallel.
In order to achieve this, the basename of the library was changed to
libnl-3 which reflects the 3rd generation of libnl APIs. It also means
that release based library versioning is left behind and libtool
versioning is used instead.
Projects using pkgconfig will automatically link against the new library
basename and will not notice a difference.
The SO versioning is based on the glib model:
current := 100 * minor + micro - revision
revision := revision
age := age (number of backwards compatible versions)
This allows for multiple major versions to be installed in parallel. Pkg-config
files are adapted to provide appropriate cflags to find new header locations.
Issues solved:
* PACKAGE_VERSION was abused for SOVERSION
* unneeded DEP stage
* did not support out-of-tree builds
* no way to turn off silent mode
* overriding CFLAGS at make time was not supported
* no static libs were provided
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>