Prepare for hardware feature detection on other platforms.
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Description

Prepare for hardware feature detection on other platforms.

* configure.ac (GCRYPT_HWF_MODULES): New.
(HAVE_CPU_ARCH_X86, HAVE_CPU_ARCH_ALPHA, HAVE_CPU_ARCH_SPARC)
(HAVE_CPU_ARCH_MIPS, HAVE_CPU_ARCH_M68K, HAVE_CPU_ARCH_PPC)
(HAVE_CPU_ARCH_ARM): New AC_DEFINEs.
* mpi/config.links (mpi_cpu_arch): New.
* src/global.c (print_config): Print new tag "cpu-arch".
* src/Makefile.am (libgcrypt_la_SOURCES): Add hwf-common.h
(EXTRA_libgcrypt_la_SOURCES): New.
(gcrypt_hwf_modules): New.
(libgcrypt_la_DEPENDENCIES, libgcrypt_la_LIBADD): Add that one.
* src/hwfeatures.c: Factor most code out to ...
* src/hwf-x86.c: New file.
(detect_x86_gnuc): Return the feature vector.
(_gcry_hwf_detect_x86): New.
* src/hwf-common.h: New.
* src/hwfeatures.c (_gcry_detect_hw_features): Dispatch using
HAVE_CPU_ARCH_ macros.