[compiler-rt] Disable installation of sanitizer and xray headers

[clm]

Summary

This patch causes the installation of headers for the sanitizer and/or xray to be disabled when COMPILER_RT_BUILD_SANITIZERS=OFF and/or COMPILER_RT_BUILD_XRAY=OFF.

[dberris]

LGTM

include/CMakeLists.txt

+if (COMPILER_RT_BUILD_SANITIZERS)
   set(SANITIZER_HEADERS
     sanitizer/allocator_interface.h
     sanitizer/asan_interface.h
     sanitizer/common_interface_defs.h
     sanitizer/coverage_interface.h
     sanitizer/dfsan_interface.h
     sanitizer/esan_interface.h
     sanitizer/linux_syscall_hooks.h
     sanitizer/lsan_interface.h
     sanitizer/msan_interface.h
     sanitizer/tsan_interface_atomic.h)
+endif(COMPILER_RT_BUILD_SANITIZERS)
 
+if (COMPILER_RT_BUILD_XRAY)
   set(XRAY_HEADERS
     xray/xray_interface.h)
+endif(COMPILER_RT_BUILD_XRAY)
 
 set(COMPILER_RT_HEADERS
   ${SANITIZER_HEADERS}