easy to fix linker error on some systems including macosx

```
There is a linker error on some system.

All that is required to fix it is adding the static keyword to the following 
inlined function:

https://code.google.com/p/chimerascan/source/browse/tags/chimerascan_v0.4.3.1/ch
imerascan/pysam/samtools/ksort.h#144


```

Original issue reported on code.google.com by `andrew.m...@gmail.com` on 16 May 2014 at 10:50
