rsync: only add dependencies on target

Our recent rebase of upstream poky caused a build failure. The failure
was a "Dependency loop" failure. The following gist has the output:
https://gist.github.com/geissonator/fb078233c99ffad5b38ad6195db0a403

The root of the issue was OpenBMC's rsync bbappend which adds popt and
zlib as DEPENDS for both the native and target builds. This dependency
on the native build is what caused the issue.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I751cb0212ea711e51f6e7e2d338d83f7eeeab8de
diff --git a/meta-phosphor/recipes-devtools/rsync/rsync_%.bbappend b/meta-phosphor/recipes-devtools/rsync/rsync_%.bbappend
index eafb15b..a7061c0 100644
--- a/meta-phosphor/recipes-devtools/rsync/rsync_%.bbappend
+++ b/meta-phosphor/recipes-devtools/rsync/rsync_%.bbappend
@@ -1,6 +1,7 @@
-EXTRA_OECONF_append += " --disable-largefile --disable-locale --disable-iconv \
-                         --without-included-popt --without-included-zlib"
+EXTRA_OECONF_append_class-target += " --disable-largefile --disable-locale \
+                                      --disable-iconv --without-included-popt \
+                                      --without-included-zlib"
 
 PACKAGECONFIG = ""
 
-DEPENDS_append = " popt zlib"
+DEPENDS_append_class-target = " popt zlib"