Don't use CPP in Configurations/unix-Makefile.tmpl #5872
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We started using$(CPP) instead of $ (CC) -E, with the assumption that
CPP would be predefined. This is, however, not always true, and
rather depends on the 'make' implementation. Furthermore, on
platforms where CPP=cpp or something else other than '$(CC) -E',
there's a risk that it won't understand machine specific flags that we
pass to it. So it turns out that trying to use $(CPP) was a mistake,
and we therefore revert that use back to using $(CC) -E directly.
Fixes #5867
Note: this affects config targets that use Alpha, ARM, IA64, MIPS,
s390x or SPARC assembler modules.