Make Error for C examples

[davidcGIThub]

When I follow the instructions on the readme for the C examples and I run

make static_library -j 4 && make examples

in the hpipm root folder I get the following error.

Parsing Makefile.rule
cp libhpipm.a ./examples/c/libhpipm.a
( cd examples/c; make obj )
make[1]: Entering directory '/home/david/Code/hpipm/examples/c'
Parsing Makefile.rule
make[1]: *** No rule to make target 'data/mass_spring_qp_data.o', needed by 'obj'.  Stop.
make[1]: Leaving directory '/home/david/Code/hpipm/examples/c'
make: *** [Makefile:284: examples] Error 2

[giaf]

Thanks for reporting, as an example I added the missing data for the mass spring system with 2 masses and 1 control, and softed final state bound that would be infieasible if not softed.
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