variable_watch: Revise wording of dropped access

Also remove enumeration value for dropped access type.
Merge topic 'variable_watch-no-allowed-access' into next

4f20b075 variable_watch: Revise wording of dropped access
variable_watch: Remove undocumented and redundant access type

The ALLOWED_UNKNOWN_VARIABLE_READ_ACCESS access type was switched on an
undocumented variable and its lookup caused an unnecessary performance
impact.  Remove it.
Merge topic 'variable_watch-no-allowed-access' into next

d8498003 variable_watch: Remove undocumented and redundant access type
Merge topic 'FindQt_versioned_tools'

0645eedb FindQt[34]: Prefer matching versioned tool names
Merge topic 'OpenBSD-paths'

bd32b682 OpenBSD: honor the LOCALBASE and X11BASE environment variables
Merge topic 'COMPILE_FEATURES-genex'

0dfe395e Features: Add COMPILE_FEATURES generator expression.
aa8a6fce cmMakefile: Add methods for checking availability of a feature.
b6dedf03 cmMakefile: Extract CheckNeeded{C,Cxx}Language methods.
8dd129df cmMakefile: Extract CompileFeaturesAvailable method.
6b9b2fff cmMakefile: Extract CompileFeatureKnown method.
Merge topic 'ninja-intel-ipo'

b6e2e0d1 Ninja: Fix Intel interprocedural optimization with static libraries
5d12b87b cmGeneratorTarget: Improve GetCreateRuleVariable API
c2eeb08b cmTarget: Add GetFeatureAsBool method
Merge branch 'master' into next