Bug#940330: libsnappy-dev: objects in libsnappy-shared.a need to be compiled with -fPIC on hppa

[李健秋]

Package: libsnappy-dev
Followup-For: Bug #940330

Dear Maintainer,

I hit the same issue. And I found add "POSITION_INDEPENDENT_CODE on" in
CMakelists.txt solves the problem:
```
-SET_TARGET_PROPERTIES(snappy-static PROPERTIES OUTPUT_NAME snappy)
+SET_TARGET_PROPERTIES(snappy-static PROPERTIES POSITION_INDEPENDENT_CODE on 
OUTPUT_NAME snappy)
```

Best regards,
-Andrew