Fixing gcc linkage issue (C11 Standards 6.7.4)

[tomkp75]

After compiling with GNU gcc or installing via pip I can't import wWigIO:

import wWigIO
Traceback (most recent call last):
File "", line 1, in
ImportError: /root/venv/lib/python2.7/site-packages/wWigIO.so: undefined symbol: cmpTwoBits32

Either giving it internal linkage with "static inline" or external linkage in the header would fix the issue.