community/lightdm-gtk-greeter: add exo depend

checking for exo-csource... no
configure: error: in `/home/buildozer/aports/community/lightdm-gtk-greeter/src/lightdm-gtk-greeter-2.0.6':
configure: error: exo-csource not installed
See `config.log' for more details

community/lightdm-gtk-greeter/APKBUILD

@@ -8,7 +8,7 @@ url="https://launchpad.net/lightdm-gtk-greeter"
 arch="all"
 license="GPL-3.0-or-later"
 depends="lightdm"
-makedepends="gtk+3.0-dev lightdm-dev exo-dev"
+makedepends="gtk+3.0-dev lightdm-dev exo exo-dev"
 subpackages="$pkgname-lang $pkgname-doc"
 source="https://launchpad.net/${pkgname}/${pkgver%.?}/${pkgver}/+download/${pkgname}-${pkgver}.tar.gz"
 options="!check"