busybox: added self contained post install

busybox/PKGBUILD

@@ -9,6 +9,7 @@ url="http://gondor.apana.org.au/~herbert/dash/"
 license=('GPL2')
 depends=('msys2-base' 'msys2-runtime')
 groups=('base')
+install=busybox.install
 source=("http://busybox.net/downloads/${pkgname}-${pkgver}.tar.bz2"
         "busybox-cygwin.patch"
         "fixsyscalls.patch"

busybox/busybox.install

@@ -0,0 +1,12 @@
+post_install() {
+  usr/bin/busybox mkdir -p /usr/busybox
+  usr/bin/busybox --install -s /usr/busybox
+}
+
+post_upgrade() {
+  post_install
+}
+
+pre_remove() {
+  usr/bin/busybox rm -rf /usr/busybox
+}