Now that we detect CPU features on 32-bit x86, allow the SSE2
implementation of Adler-32 to be selected at runtime based on the
presence of the SSE2 feature.
Replace COMPILER_SUPPORTS_TARGET_INTRINSICS with macros for the
individual features, since COMPILER_SUPPORTS_TARGET_INTRINSICS was
x86-specific and would cause confusion when we try to use intrinsics in
'target' functions for other architectures.
With clang 3.9:
warning: macro expansion producing 'defined' has undefined
behavior [-Wexpansion-to-defined]
Just eliminate the tests for clang and icc; they shouldn't be necessary.
* Bring in common headers and program code from xpack project
* Move program code to programs/
* Move library code to lib/
* GNU89 and MSVC2010 compatibility
* Other changes
