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.

src/sysupdate/sysupdate-pattern.h

@@ -6,6 +6,12 @@
 #include "sysupdate-instance.h"
 #include "time-util.h"
 
+enum {
+        PATTERN_MATCH_NO,
+        PATTERN_MATCH_YES,
+        PATTERN_MATCH_RETRY,
+};
+
 int pattern_match(const char *pattern, const char *s, InstanceMetadata *ret);
 int pattern_match_many(char **patterns, const char *s, InstanceMetadata *ret);
 int pattern_valid(const char *pattern);