utils/genrandconfig: add aufs-util handling

Add a custom case to make sure that a random configuration with an empty
version for aufs-util doesn't fail.

Fixes:
 - http://autobuild.buildroot.org/results/e242cf66a02983bcf6e95b37f8e458bd18aee683

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit fee46b54e7b51c6b40fa57cf03fb150c21fdf8e5)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

utils/genrandconfig

@@ -299,6 +299,9 @@ def fixup_config(sysinfo, configfile):
     if 'BR2_TOOLCHAIN_EXTERNAL_CODESOURCERY_NIOSII=y\n' in configlines and \
        'BR2_PACKAGE_FLANN=y\n' in configlines:
         return False
+    if 'BR2_PACKAGE_AUFS_UTIL=y\n' in configlines and \
+       'BR2_PACKAGE_AUFS_UTIL_VERSION=""\n' in configlines:
+        return False
 
     if 'BR2_PACKAGE_HOST_UBOOT_TOOLS_ENVIMAGE=y\n' in configlines and \
        'BR2_PACKAGE_HOST_UBOOT_TOOLS_ENVIMAGE_SOURCE=""\n' in configlines and \