layer.conf: Allow sysroot dependencies on perlcross-native to be skipped

The only thing which needs perlcross-native will depend upon it directly
so we can optimise this out everywhere else for small space/speed gains.

(From OE-Core rev: 3b86109a2571be39f9cfa85bd4db22f4df025ab2)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/conf/layer.conf

@@ -105,6 +105,7 @@ SSTATE_EXCLUDEDEPS_SYSROOT += "\
     .*->gperf-native \
     .*->gtk-doc-native \
     .*->texinfo-native \
+    .*->perlcross-native \
     libarchive-native->e2fsprogs-native \
 "
 # Nothing needs to depend on libc-initial