Install dkms before using it.

Updates the new 99-dkms element so that it installs the package
before using it.

Fixes LP Bug #1183785.

Change-Id: Ia191ed3cae707a8c8591f849dc0c6293e849d64a

elements/base/post-install.d/99-dkms

@@ -7,6 +7,8 @@ kernels=$(ls /usr/src/linux-headers-*-*-* -d | sed -e 's|/usr/src/linux-headers-
 __ARCH=$ARCH
 unset ARCH
 
+install-packages dkms
+
 for module in $modules ; do
   for kernel in $kernels ; do
     dkms build $module -k $kernel