36912: vcs_info quilt: Tolerate being in child of .pc's parent

Without this, gen-applied-string would only be set when .pc is a child of cwd,
not when it is a child of an ancestor of cwd.

Functions/VCS_Info/VCS_INFO_quilt

@@ -119,6 +119,7 @@ function VCS_INFO_quilt() {
             applied=()
         fi
         patches=$(<$pc/.quilt_patches)
+        patches=`builtin cd -q "${pc:h}" && print -r - ${patches:A}`
     fi
     if zstyle -t "${context}" get-unapplied; then
         # This zstyle call needs to be moved further up if `quilt' needs