skip the test log2_approx.complete when using ctest

To skip the test, we use the gtest command line parameter "--gtest_filter" to filter out the unwanted test.
This parameter is described as follows:

--gtest_filter=POSITIVE_PATTERNS[-NEGATIVE_PATTERNS]
      Run only the tests whose name matches one of the positive patterns but
      none of the negative patterns. '?' matches any single character; '*'
      matches any substring; ':' separates two patterns.

openair1/PHY/TOOLS/tests/CMakeLists.txt

@@ -14,4 +14,4 @@ add_executable(test_log2_approx test_log2_approx.cpp ../log2_approx.c)
 target_link_libraries(test_log2_approx PRIVATE GTest::gtest LOG minimal_lib)
 add_dependencies(tests test_log2_approx)
 add_test(NAME test_log2_approx
-  COMMAND ./test_log2_approx)
+  COMMAND ./test_log2_approx --gtest_filter=-log2_approx.complete)