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Remove the FLANG_INCLUDE_RUNTIME option which was replaced by LLVM_ENABLE_RUNTIMES=flang-rt. The FLANG_INCLUDE_RUNTIME option was added in #122336 which disables the non-runtimes build instructions for the Flang runtime so they do not conflict with the LLVM_ENABLE_RUNTIMES=flang-rt option added in #110217. In order to not maintain multiple build instructions for the same thing, this PR completely removes the old build instructions (effectively forcing FLANG_INCLUDE_RUNTIME=OFF). As per discussion in https://discourse.llvm.org/t/buildbot-changes-with-llvm-enable-runtimes-flang-rt/83571/2 we now implicitly add LLVM_ENABLE_RUNTIMES=flang-rt whenever Flang is compiled in a bootstrapping (non-standalone) build. Because it is possible to build Flang-RT separately, this behavior can be disabled using `-DFLANG_ENABLE_FLANG_RT=OFF`. Also see the discussion an implicitly adding runtimes/projects in #123964.