[gpsd-dev] [PATCH]: Link Python extensions with libpython

[Matt]

The Cygwin linker needs gps/clienthelpers.{so,dll} to be built with 
-lpython<version> (on my Cygwin system, libpython2.7).

gcc -shared -Wl,--enable-auto-image-base -L. -o gps/clienthelpers.dll 
-Wl,-rpath=//usr/local/lib -Wl,--out-implib=gps/libclienthelpers.dll.a 
-Wl,--export-all-symbols -Wl,--enable-auto-import -Wl,--whole-archive 
gpsclient-py_2_7_8_final_O.dll geoid-py_2_7_8_final_O.dll 
gpsdclient-py_2_7_8_final_O.dll strl-py_2_7_8_final_O.dll 
-Wl,--no-whole-archive -L. -lm -lrt
gpsclient-py_2_7_8_final_O.dll: In function `gpsclient_maidenhead':
/home/matthew/gpsd/gpsclient.c:58: undefined reference to `PyArg_ParseTuple'

This patch isn't entirely correct - it links all binaries and shared 
objects against the python runtime library, but only some of them (not 
all) actually need libpython. I don't yet see how to fix this.

With this change, all binaries compile on Cygwin, but regression tests 
fail due to:

gpsfake: socket error [ Errno 111] Connection refused.

I haven't root-caused this yet, but it appears shallow.

link-python-extensions-with-libpython.patch
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