FindOpenCL: Added missing ENV for each environment variable reference

Also add an 'include' path suffix that may appear after the value of
some of the environment variables.
Merge topic 'FindOpenCL-fix-ENV' into next

d4295539 FindOpenCL: Added missing ENV for each environment variable reference
Merge topic 'InstallRequiredSystemLibraries-repeat'

15a19c31 InstallRequiredSystemLibraries: Allow repeat use per-config
Merge topic 'encoding-parse-commandline'

b6b493a4 Encoding: Fix debug asserts parsing command line options with non-ascii chars.
9dc88ee9 Merge topic 'fix-valgrind-in-path'
Merge topic 'qthelp-context-fixes'

d107949d Help: Add context to titles in QtHelp.
b5002631 Help: Create proper identifiers for keywords in QtHelp.
Merge topic 'FindOpenCL-fix-ENV'

d4295539 FindOpenCL: Added missing ENV for each environment variable reference
Merge branch 'master' into next