Problem: AM_CPPFLAGS not included while compiling selftest program

Problem: AM_CPPFLAGS not included while compiling selftest program with automake (an issue with the .am file generated by zproject)

Solution: corrected the construction of src_$(project.prefix)_selftest_CPPFLAGS : from ${src_lib$(project.prefix)_la_CPPFLAGS} and not ${src_lib$(project.prefix)_la_CFLAGS}