This reverts commit b8d8cf27e290f75791679cb3bce3f250904f2367.
libraqm (an obscure PIL functionality) was recently switched to be
directly linked by Pillow, rather than dlopened, which meant it was a
bit of a hidden dependency since calibre uses the imagingft module. But
it is now directly depended on by the Arch packaging, so it no longer
needs to be installed to get a functional Pillow.