open SHM data only after cgps start

[Hans Kurscheidt]

Sorry, if I keep talking to myself here, but I'm crawling forward.

After I got gpsd running as service, I cleaned out all old references to 
libgps and libgps-dev and cleaned Visual Studio's cache.

Should be OK now.

There's no dpkg -l libgps* output anymore

VisualStudio finds the richgt gps.h under ../gpsd-master/..; there is no 
other gps.h somewhere.

and the linker points to so.28

ldconfig -p | grep gps
        libgpsdpacket.so.28 (libc6,hard-float) => 
/usr/local/lib/libgpsdpacket.so.28
        libgpsdpacket.so (libc6,hard-float) => 
/usr/local/lib/libgpsdpacket.so
        libgps.so.28 (libc6,hard-float) => /usr/local/lib/libgps.so.28
        libgps.so (libc6,hard-float) => /usr/local/lib/libgps.so
        libQgpsmm.so.28 (libc6,hard-float) => 
/usr/local/lib/libQgpsmm.so.28
        libQgpsmm.so (libc6,hard-float) => /usr/local/lib/libQgpsmm.so

The compilation/linking is OK w/out errors or warnings and the 
executable is runable

BUT, I still have the old problem. (assume gpsd service running and fix 
available)

If I run my app after boot, No gps data is available and just once I got 
an error message, which I cannot reproduce, saying something like:

shared library error cannot ... data: No such file or directory

After running cgps once, data is available and remains 2b supplied to my 
app, even if I close cgps. This is reproduceable.

RGDS

hk