vim: work around rpm picking up perl as a dep

Some perl example scripts cause RPM to add perl as a
dep, which we don't want, so remove x bit as work around
just like the ones for csh and awk.

Refer to:
1b088e4 vim: workaround nawk dependency problem with RPM
280d150 vim: workaround a dependency problem with RPM

I think a better solution might be:
Split the tools directory into a new package ${PN}-tools
and add RDEPENDS on csh, awk and perl for it and we don't
put it in RRECOMMENDS to install along with vim.

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>