libpacman: Add pkg_name as an alias to tp->name.
libpacman: Use continue instead of using a conditional on a big for block.
libpacman: Remove a usage of local 'packages' variable.
libpacman: Move all addition logic from _pacman_trans_addtarget to _pacman_trans_add.
libpacman: Introduce _pacman_trans_add_pkg, and move holdpkg check to _pacman_trans_add.
libpacman: When a transpkg is 'compressed', let's not leak the given transpkg.
libpacman: Use _pacman_trans_add_pkg.