Remove import/use of File::Spec::Function

It looks like the usage of these functions were removed in
in commit 0a4edb93 ("Unified - adapt
the generation of cpuid, uplink and buildinf to use GENERATE").

This commit removes the import/use of File::Spec::Functions module as it
is no longer needed by crypto/build.info.
Reviewed-by: NAndy Polyakov <appro@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5832)

crypto/build.info

-{- use File::Spec::Functions qw/catdir catfile/; -}
 LIBS=../libcrypto
 SOURCE[../libcrypto]=\
         cryptlib.c mem.c mem_dbg.c cversion.c ex_data.c cpt_err.c \