makepkg: add libprovides support

The user adds libaries to the provides array without a version. These
must end with .so.
Example: provides=(readline libreadline.so)

find_libprovides() looks for .so files (not symlinks because these could
point outside of pkgdir) in $pkgdir, extracts the library soname (ld
links the binary to this name) and outputs provides seperated by spaces.
This list contains all libraries provided by the package.
Example: libfoo.so=3-64

write_pkginfo() only keeps .so provides with version information and warns
the user about unneded ones.

Support-by: Thomas Bächler <thomas@archlinux.org>
Support-by: Christoph Schied <Christoph.Schied@uni-ulm.de>
Signed-off-by: Florian Pritz <bluewind@server-speed.net>

0 files changed, 0 insertions, 0 deletions