Don't use CPP in Configurations/unix-Makefile.tmpl
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. Reviewed-by: Andy Polyakov <appro@openssl.org> (Merged from https://github.com/openssl/openssl/pull/5871)
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