Fix: use each version only for the line it's specified in, not the next ones too.

rubygems.py

@@ -162,6 +162,7 @@ class Recipe(object):
             self._install_rubygems()
             gem_executable = self.get_gem_executable(bindir)
 
+        for gemname in self.gems:
             s = {
                 'GEM': gem_executable,
                 'OPTIONS': ' '.join([
@@ -170,7 +171,6 @@ class Recipe(object):
                         '--bindir=%s' % bindir,
                     ]),
             }
-        for gemname in self.gems:
             if '==' in gemname:
                 gemname, version = gemname.split('==', 1)
                 s['GEMNAME'] = gemname.strip()