sdk: Fix RPM dependencies for EL6

The names of some packages are different in EL6 and in Fedora. The
current .spec uses the Fedora names. This patch changes the .spec so
that it will work in both Fedora and EL6.

Change-Id: Ia18cfd0e8be01286727f2ad16782972c4a50a3c5
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>