vim: restore the 'chmod -x' workaround in do_install

These workarounds are removed because a previous patch
solve the host path reference for gawk and perl, and it skips
the do_package_qa issue by setting the INSANE_SKIP. But it
introduces regression for do_rootfs. The dependencies are
calculated and will require packages like python, perl, gawk
and csh. The error is like below.

Error:
 Problem: conflicting requests
    - nothing provides /bin/csh needed by vim-tools-8.2-r0.corei7_64
    - nothing provides /usr/bin/nawk needed by vim-tools-8.2-r0.corei7_64
    - nothing provides /usr/bin/python needed by vim-tools-8.2-r0.corei7_64

So we keep the previous patch which solve the host path reference
problem and restore the long-used 'chmod -x' workaround here.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>