I noticed that some files in rubygems were executable, and I could think
of no reason why they should be.
In general, I think ruby files should never have the executable bit set
unless they include a shebang, so I run the following command over the
whole repo:
```bash
find . -name '*.rb' -type f -executable -exec bash -c 'grep -L "^#!" $1 || chmod -x $1' _ {} \;
```
Because signed gem is not working on rubygems ecosystem.
* tool/gem-unpack.rb: ditto.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56399 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* common.mk (extract-gems): extract gem files to install them even
if zlib is not available.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49271 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
