filesystem: install /dev/shm with sticky bit set

filesystem/.footprint

@@ -3,7 +3,7 @@ drwxr-xr-x	root/root	boot/
 drwxr-xr-x	root/root	dev/
 crw-------	root/root	dev/console (5, 1)
 drwxr-xr-x	root/root	dev/pts/
-drwxr-xr-x	root/root	dev/shm/
+drwxrwxrwt	root/root	dev/shm/
 drwxr-xr-x	root/root	etc/
 -rw-r--r--	root/root	etc/fstab
 -rw-r--r--	root/root	etc/group

filesystem/.signature

@@ -1,7 +1,7 @@
 untrusted comment: verify with /etc/ports/core.pub
-RWRJc1FUaeVeqi7hoiTR/wdRV2uQBcaVr0+bJhQQ5KM6hqwH2azymn1DhLNbkw8hh4jE8t+OP8vQZ/jiRKacHZSAcNA1ewx2Pw4=
-SHA256 (Pkgfile) = 565fe5c77e8d7526915d8e81a62951c2ad785980bd7b327eff2072d503ef1aad
-SHA256 (.footprint) = 63a0c3f368866267abe10cef671ad7bb271546fcefa5896b6ff13853d6b16802
+RWRJc1FUaeVeqtMRu2st5fDGUxOojQzbMz0BJMviiISlkddLgZs5eM5FBNuNxH83MOruINKFXDn3XaYskL/vstVKOOnWzsXm2gQ=
+SHA256 (Pkgfile) = 96b3dd183df45a755fb3d102ee5b88eba61e7d7e5bf86427345713598a5a96dc
+SHA256 (.footprint) = 71e16dd60d5918bb5d50a6adf37048ef35f0d3d2b1d1f3e5f4bbfb9ce22841cd
 SHA256 (issue) = e8f3a830102f902bf869c946634215f419ff76f4e03f627d84b8809ed85e65c2
 SHA256 (motd) = e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
 SHA256 (shells) = f5e8838cb33249bd0ab3a169097bcc411cfb1b37153f268e6655758942e46656

filesystem/Pkgfile

@@ -4,7 +4,7 @@
 
 name=filesystem
 version=3.4
-release=3
+release=4
 source=(issue motd shells group passwd shadow securetty fstab mime.types)
 
 build() {
@@ -13,7 +13,7 @@ build() {
     install -d $PKG/sbin
     install -d $PKG/boot
     install -d $PKG/dev
-    install -d $PKG/dev/{pts,shm}
+    install -d $PKG/dev/pts
     install -d $PKG/proc
     install -d $PKG/sys
     install -d $PKG/etc
@@ -50,6 +50,7 @@ build() {
     install -d -m 1777 $PKG/var/lock
     install -d -m 1777 $PKG/var/spool/mail
     install -d -m 1777 $PKG/var/tmp
+    install -d -m 1777 $PKG/dev/shm
 
     # /dev
     mknod $PKG/dev/console c 5 1