powerpc: check for missing optimization level for vector register usage
6951e0f591cc
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Description

powerpc: check for missing optimization level for vector register usage

* cipher/Makefile.am [ENABLE_PPC_VCRYPTO_EXTRA_CFLAGS]
(ppc_vcrypto_cflags): Add '-O2'.
* configure.ac (gcry_cv_cc_ppc_altivec): Check for missing compiler
optimization with vec_sld_u32 inline function.
* configure.ac (gcry_cv_cc_ppc_altivec_cflags): Check for missing
compiler optimization with vec_sld_u32 inline function; Add '-O2' to
CFLAGS.

Attempt to enable optimization for PPC vector register implementations
if PPC altivec check does not pass otherwise.