jruby gem install chops off first character from files it extracts

This seems like a very strange bug. I am running rvm 1.10.2.

I am able to install jruby-head but at the end it cannot install jruby-launcher gem because it does not find extconf.rb. Looking in the directory I see this:

```
COPYING g.c nixlauncher.h tilsfuncs.cpp
EADME.txt gem_make.out pec tilsfuncs.h
akefile ib rgnames.h tilsfuncswin.cpp
b_w32_cmdvector.h latformlauncher.cpp rgparser.cpp trlcpy.c
bexecloader.h latformlauncher.h rgparser.h vmlauncher.cpp
ersion.h nc ruby.cpp vmlauncher.h
esources nixlauncher.cpp rubyexe.cpp xtconf.rb
```

Please note EAMDE.txt, akefile, esources, xtconf.rb etc.

I tried deleting the .rvm/gems/jruby-head/gems/ directory and running it again. I apologize if this is not a jruby issue. Maybe it is gem or rvm. This is only happening on jruby-head. jruby 1.6.6 and even jruby-head a few days ago was working.