Fix macOS framework builds #439
                
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This PR fixes 2 issues with CI builds of macOS framework:
OPUS_BUILD_FRAMEWORK, notBUILD_FRAMEWORK.CMAKE_OSX_ARCHITECTURESshould be set, otherwise host arch will be used.P.S.
2 more thoughts:
OPUS_BUILD_FRAMEWORK, notBUILD_FRAMEWORKFRAMEWORK_VERSIONin cmake list should be probably set to "A" (major verison), not${PROJECT_VERSION}