re.compile inference returns incorrect result

### Steps to reproduce
1. Execute
```
import astroid
code = """
import re
_ENCODING_RGX = re.compile(r"f")
_ENCODING_RGX #@
"""
print(astroid.extract_node(code).inferred())
```

This is causing the Travis CI pylint env to fail with:
```
************* Module astroid.builder
E: 64,20: Instance of 'str' has no 'match' member (no-member)
```

### Current behavior

The above prints `[Uninferable, ]`

### Expected behavior

Should return an `Instance of _sre.SRE_Pattern`

### ``python -c "from astroid import __pkginfo__; print(__pkginfo__.version)"`` output

5d21b2005b06e3a353dd64aa16c6db5628058ed8

Reproduce the result with the provided astroid.extract_node example and inspect the astroid.builder location reported by pylint. Trace how re.compile is inferred and compare the result with the expected _sre.SRE_Pattern instance. Done means the example infers the compiled pattern rather than returning a string constant or Uninferable.

Written by the indexing model from the issue text.