Rewrite the handling of libdepends. The primary advantage are:
- Moves functionality from write_pkginfo() to find_libdepends().
- The order of the depends array in the PKGBUILD is kept in the package.
- An unneeded libdepends is only a warning and not an error. This allows
putting a libdepend on a library that is dlopened.
- It is now modular so can be extended to library types other than
ELF *.so.
- Finding the list of libraries a package depends only occurs when a
libdepend is specified in the depends array.
Signed-off-by: Allan McRae <allan@archlinux.org>
9a76a458b8