Revert "dpdk-ovs: fix undefined refs to dlopen on Fedora"

This reverts commit 7f1e2c7494fc028c8bdfe666673f1a6840bcf95a.
qemu: fix undefined ref to dlopen on Fedora

On fedora hosts, qemu may fail with an error like:
 LINK  x86_64-softmmu/qemu-system-x86_64
/usr/bin/ld:
/home/pb/dpdk-1.6.0r2//x86_64-ivshmem-linuxapp-gcc/lib/librte_eal.a(eal.o):
undefined reference to symbol 'dlopen@@GLIBC_2.2.5'
/usr/bin/ld: note: 'dlopen@@GLIBC_2.2.5' is defined in DSO
/lib64/libdl.so.2 so try adding it to the linker command line
/lib64/libdl.so.2: could not read symbols: Invalid operation

Adding -ldl fixes the issue.

Signed-off-by: Paul Barrette <paul.barrette@windriver.com>