xfce4-panel: fix QA warnings static libs in dev package

There was a patch sent already for fixing [1]. In that patch the static
libraries of panel plugins were deleted during install. Here all static libs
are packed into ${PN}-staticdev. The decision for this solution is based on:

* Keep recipes as simple as possible
* Although unlikely there might be a use case for having static libs for panel
  plugins

[1] http://lists.linuxtogo.org/pipermail/openembedded-devel/2012-February/037926.html

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>

meta-xfce/recipes-xfce/xfce4-panel/xfce4-panel_4.8.6.bb

@@ -4,7 +4,7 @@ LICENSE = "GPLv2"
 LIC_FILES_CHKSUM = "file://COPYING;md5=26a8bd75d8f8498bdbbe64a27791d4ee"
 DEPENDS = "libxfce4util garcon libxfce4ui xfconf exo gtk+ dbus cairo virtual/libx11 libxml2 libwnck"
 
-PR = "r1"
+PR = "r2"
 
 inherit xfce
 
@@ -27,7 +27,7 @@ FILES_${PN} += "${libdir}/xfce4/panel/migrate \
 FILES_${PN}-dbg += "${libdir}/xfce4/panel/plugins/.debug \
 		   "
 
-FILES_${PN}-dev += "${libdir}/xfce4/panel/plugins/*.*a \
+FILES_${PN}-staticdev += "${libdir}/xfce4/panel/plugins/*.*a \
                    "
 
 SRC_URI[md5sum] = "9d7bf0503d5867c4044cef04bb5845b1"