portage: permit to build on tmpfs

My portage PORTAGE_TMPDIR directory is on a tmpfs, but emerging openssl fail with:
Can not execute files in /var/tmp/portage
This is due to missing rules permiting portage to execute files in
tmpfs.
After this error, some relabel/manage rules was still missing, so this
commit add them also.

Signed-off-by: Corentin LABBE <[email protected]>

policy/modules/admin/portage.if

@@ -116,11 +116,15 @@ interface(`portage_compile_domain',`
  # SELinux-enabled programs running in the sandbox
  allow $1 portage_tmp_t:file relabel_file_perms;
 
+ can_exec($1, portage_tmpfs_t)
+ manage_dirs_pattern($1, portage_tmpfs_t, portage_tmpfs_t)
  manage_files_pattern($1, portage_tmpfs_t, portage_tmpfs_t)
  manage_lnk_files_pattern($1, portage_tmpfs_t, portage_tmpfs_t)
  manage_fifo_files_pattern($1, portage_tmpfs_t, portage_tmpfs_t)
  manage_sock_files_pattern($1, portage_tmpfs_t, portage_tmpfs_t)
  fs_tmpfs_filetrans($1, portage_tmpfs_t, { dir file lnk_file sock_file fifo_file })
+ relabel_files_pattern($1, portage_tmpfs_t, portage_tmpfs_t)
+ relabel_dirs_pattern($1, portage_tmpfs_t, portage_tmpfs_t)
 
  kernel_read_system_state($1)
  kernel_read_network_state($1)