sysupdate: Allow patterns to match path with directories

`MatchPattern` for regular-file and directory as target can now match
subdirectories This is useful to install files for examples in `.extra.d`
directories:

```
[Target]
Type=regular-file
Path=/EFI/Linux
PathRelativeTo=boot
MatchPattern=gnomeos_@v.efi.extra.d/apparmor.addon.efi
```

The if the directories in the path do not exist, they will be created.  Whereas
the part in `Path` is not created.

test/units/testsuite-72.sh

@@ -50,6 +50,9 @@ new_version() {
     # Create a random "UKI" payload
     echo $RANDOM >"/var/tmp/72-source/uki-$2.efi"
 
+    # Create a random extra payload
+    echo $RANDOM >"/var/tmp/72-source/uki-extra-$2.efi"
+
     # Create tarball of a directory
     mkdir -p "/var/tmp/72-source/dir-$2"
     echo $RANDOM >"/var/tmp/72-source/dir-$2/foo.txt"
@@ -88,6 +91,9 @@ verify_version() {
     cmp "/var/tmp/72-source/uki-$3.efi" "/var/tmp/72-xbootldr/EFI/Linux/uki_$3+3-0.efi"
     test -z "$(ls -A /var/tmp/72-esp/EFI/Linux)"
 
+    # Check the extra efi
+    cmp "/var/tmp/72-source/uki-extra-$3.efi" "/var/tmp/72-xbootldr/EFI/Linux/uki_$3.efi.extra.d/extra.addon.efi"
+
     # Check the directories
     cmp "/var/tmp/72-source/dir-$3/foo.txt" /var/tmp/72-dirs/current/foo.txt
     cmp "/var/tmp/72-source/dir-$3/bar.txt" /var/tmp/72-dirs/current/bar.txt
@@ -183,6 +189,21 @@ Mode=0444
 TriesLeft=3
 TriesDone=0
 InstancesMax=2
+EOF
+
+    cat >/var/tmp/72-defs/05-fifth.conf <<EOF
+[Source]
+Type=regular-file
+Path=/var/tmp/72-source
+MatchPattern=uki-extra-@v.efi
+
+[Target]
+Type=regular-file
+Path=/EFI/Linux
+PathRelativeTo=boot
+MatchPattern=uki_@v.efi.extra.d/extra.addon.efi
+Mode=0444
+InstancesMax=2
 EOF
 
     rm -rf /var/tmp/72-esp /var/tmp/72-xbootldr
@@ -206,6 +227,8 @@ EOF
     update_now
     verify_version "$blockdev" "$sector_size" v3 1 3
     test ! -f "/var/tmp/72-xbootldr/EFI/Linux/uki_v1+3-0.efi"
+    test ! -f "/var/tmp/72-xbootldr/EFI/Linux/uki_v1.efi.extra.d/extra.addon.efi"
+    test ! -d "/var/tmp/72-xbootldr/EFI/Linux/uki_v1.efi.extra.d"
 
     # Create fourth version, and update through a file:// URL. This should be
     # almost as good as testing HTTP, but is simpler for us to set up. file:// is