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FindOpenACC does not set OpenACC_FOUND variable

The FindOpenACC module only sets OpenACC_<lang>_FOUND variables but not OpenACC_FOUND. Subsequently, this means a find_package(OpenACC) never results in a successful feature discovery, registering OpenACC always in the PACKAGES_NOT_FOUND global property. (Evident e.g. by a call to feature_summary).

The following should be fixed in FindOpenACC to make it behave similar to the FindOpenMP package:

  1. Add support for COMPONENTS <lang> specifier to further qualify which OpenACC language support is required
  2. Set OpenACC_FOUND if all requested language components have been found.
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