bad linkage of libuv to libjulia-codegen

it is bad that libuv is getting copied into libjulia-codegen since we end up with inconsistent state
```
objdump -t  libjulia-codegen.so|grep 'uv_'
0000000000166959 l     F .text  0000000000000034              uv__update_time
000000000016698d l     F .text  0000000000000038              uv__basename_r
```