Removed compilation of genstrenum and it's invocation

Enums have been copied to single .h file currently.
Squashed 'evfibers/' content from commit 43b7a92

git-subtree-dir: evfibers
git-subtree-split: 43b7a923617a276b922965508cda9c85f1897353
Merge commit '3a932180c75a2477f7e661eb4903e1a5b451dbd7' as 'evfibers'
Support for embedded libevfibers