[cmake] Create the LLVM_BUILD_UTILS option.
This option is the equivalent option to LLVM_BUILD_TOOLS but for executables
created via add_llvm_utility.
This is a useful tool for improving compile time in situations where LLVM is
used as a library and no testing tools are needed.
It follows the exact same implemention model as LLVM_BUILD_TOOLS.
Since the option is by default set to on, no behavior is changed unless one sets
it from the command line to be false.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275007
91177308-0d34-0410-b5e6-
96231b3b80d8
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