dash: create /bin/sh symlink at pre INSTALL, iff doesn't exist.

srcpkgs/dash/INSTALL

@@ -0,0 +1,7 @@
+case ${ACTION} in
+pre)
+	# It's expected that will make a dangling symlink, but once that
+	# dash is unpacked it will be ok.
+	[ ! -h bin/sh ] && cd bin && ln -sf dash sh
+	;;
+esac

srcpkgs/dash/template

@@ -1,6 +1,7 @@
 # Template file for 'dash'
 pkgname=dash
 version=0.5.6.1
+revision=1
 distfiles="http://gondor.apana.org.au/~herbert/dash/files/$pkgname-$version.tar.gz"
 build_style=gnu_configure
 configure_args="--prefix="
@@ -21,8 +22,3 @@ Add_dependency run glibc
 Add_dependency run coreutils
 Add_dependency build bison
 Add_dependency build coreutils
-
-post_install()
-{
-	cd ${DESTDIR}/bin && ln -s dash sh
-}