Make third_party/benchmark's configure script less noisy

We don't need to debug it anymore and, if we do, we can always pass this
in on the CMake command line. (I think CMake might also log it in the
build directory somewhere? And there's --debug-trycompile.)

Bug: 383769319
Change-Id: I2342655ab312986cd0d87895ab03c11db303a97f
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/85427
Reviewed-by: Rudolf Polzer <rpolzer@google.com>
Auto-Submit: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Commit-Queue: Rudolf Polzer <rpolzer@google.com>

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2325956..9cd1f9e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -425,7 +425,6 @@
     set(BENCHMARK_ENABLE_TESTING OFF)
     set(BENCHMARK_ENABLE_INSTALL OFF)
     set(BENCHMARK_INSTALL_DOCS OFF)
-    set(CXXFEATURECHECK_DEBUG ON)
     if(USE_CUSTOM_LIBCXX)
       # benchmark's feature testing does not pick up the custom STL.
       set(HAVE_STD_REGEX 1)