cmake: mark the xlog tests as BROKEN

Summary:
The xlog test currently fails due to the way that CMake invokes the compiler
with absolute path names.  In the future we should probably update the xlog
code with the ability to strip off some directory prefixes.

Reviewed By: yfeldblum

Differential Revision: D6817547

fbshipit-source-id: 40f08d56d0199c21808a4046ebc1a3a9d70a33e9

CMakeLists.txt

@@ -484,7 +484,11 @@ if (BUILD_TESTS)
       TEST printf_test SOURCES PrintfTest.cpp
       TEST rate_limiter_test SOURCES RateLimiterTest.cpp
       TEST standard_log_handler_test SOURCES StandardLogHandlerTest.cpp
-      TEST xlog_test
+      # This test is currently broken in CMake-based builds given
+      # that CMake passes absolute source paths to the compiler;
+      # the xlog code probably should be updated to support stripping off
+      # project directory prefixes.
+      TEST xlog_test BROKEN
         HEADERS
           XlogHeader1.h
           XlogHeader2.h