Some small issues

[tsijs]

I am compiling hpipm in one big .c file for embedded use, and I came across some minor issues:

It seems that include/hpipm_d_core_qp_ipm.h and include/hpipm_s_core_qp_ipm.h have no header guard.

in the d_<problem_class>_kkt.c files, the following function placeholders are not declared:
COND_SLACKS_FACT_SOLVE
COND_SLACKS_SOLVE
EXPAND_SLACKS

[giaf]

This fixes the include guard 450a5ca

About the undeclared function placeholders, they are all static functions, so they are only used within the file.c and they don't need a global unique name. Does it cause issues to you?

[tsijs]

Aha, okay that would make sense. It created issues for me, but that is only because I needed to include all .c files in one source file for my application. But I fixed it for me by adding the placeholders.