[cmake] Update experimental target error message
Summary:
Update this error message indicate this test only ensures experimental
targets were passed via LLVM_EXPERIMENTAL_TARGETS_TO_BUILD.
Originally, this test validated all targets, but in r184923, it was moved
after the LLVMBUILDTOOL test, which also validates all targets, making
that part of the test redundant.
Differential Revision: https://reviews.llvm.org/D41273
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321012
91177308-0d34-0410-b5e6-
96231b3b80d8
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