git: remove unpackaged perl-native files

git: remove unpackaged perl-native files

${libdir} is not applicable for the install path of perl-native files,
files are always installed to /usr/lib no matter the target is 32/64
bits. After installing, remove unpackaged and unneeded perl-native
files to prevent warnings.

Fix warning:
    WARNING: For recipe git, the following files/directories were \
        installed but not shipped in any package:
    ...
    WARNING:   /usr/lib/perl-native/perl/5.14.2/Git.pm
    WARNING:   /usr/lib/perl-native/perl/5.14.2/perllocal.pod
    WARNING:   /usr/lib/perl-native/perl/5.14.2/Error.pm
    WARNING:   /usr/lib/perl-native/perl/5.14.2/auto

[YOCTO#3780]

Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>