hwfeatures: add 'all' for disabling all hardware features
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hwfeatures: add 'all' for disabling all hardware features

* .gitignore: Add 'tests/basic-disable-all-hwf'.
* configure.ac: Ditto.
* tests/Makefile.am: Ditto.
* src/hwfeatures.c (_gcry_disable_hw_feature): Match 'all' for
masking all HW features off.
(parse_hwf_deny_file): Use '_gcry_disable_hw_feature' for matching.
* tests/basic-disable-all-hwf.in: New.

Also add new test to run 'basic' with all HWF disable. With current
assembly implementations and build servers using new CPUs, generic
implementations are not being tested enough anymore and compiler
problems might end up unnoticed.