git: restore the dependency on perl-native

git: restore the dependency on perl-native

[YOCTO #1155]

I thought git-native could depend on perl-native-runtime and tests on
Ubuntu 9.04/10.10 and Fedora 13 show it could buid fine (looks these distros
install perl-ExtUtils-MakeMaker by default).

However Joshua reported on Fedora 15 i686 host, git-native can't build unless
he manually installed perl-ExtUtils-MakeMaker to the host.

This makes me think we may as well make git-native depend on perl-native.

Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>