conky-cli: simplify by using the gnu-makefile build_style

srcpkgs/conky-cli/template

@@ -2,7 +2,7 @@
 pkgname=conky-cli
 _pkgname=conky
 version=1.9.0
-revision=1
+revision=2
 build_style=gnu-configure
 configure_args="--disable-lua --disable-x11 --disable-xft --disable-imlib2 
  --disable-own-window --disable-xdamage --disable-double-buffer --enable-curl
@@ -17,8 +17,7 @@ distfiles="${SOURCEFORGE_SITE}/${_pkgname}/${_pkgname}-${version}.tar.gz"
 checksum=1de754d77b2671f68795fdb9fc506328a1668dd6ca00984c3f49790a66d368ca
 wrksrc="${_pkgname}-${version}"
 
-do_install() {
-	make PREFIX=/usr DESTDIR=$DESTDIR install
+post_install() {
 	vinstall COPYING 644 usr/share/licenses/$_pkgname
 }